{"id":12606,"date":"2025-07-17T13:52:23","date_gmt":"2025-07-17T11:52:23","guid":{"rendered":"https:\/\/www.dualis-it.de\/en\/?p=12606"},"modified":"2025-07-30T13:13:29","modified_gmt":"2025-07-30T11:13:29","slug":"atp-and-ctp-in-aps-system-ganttplan","status":"publish","type":"post","link":"https:\/\/www.dualis-it.de\/en\/atp-and-ctp-in-aps-system-ganttplan\/","title":{"rendered":"ATP and CTP in the context of APS: How GANTTPLAN APS ensures reliable delivery planning"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"mehr-verlasslichkeit-in-der-lieferkette-weniger-stress-in-der-planung-a97745b7-492e-4df2-b9cd-3571012690dc\">Stronger delivery commitments \u2013 less stress in your supply chain<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>In today\u2019s manufacturing landscape, the ability to make reliable delivery commitments is critical for customer satisfaction and maintaining a competitive edge. Two essential concepts that support this capability are&nbsp;<strong>ATP (Available-to-Promise)<\/strong>&nbsp;and&nbsp;<strong>CTP (Capable-to-Promise)<\/strong>. <strong>While ATP is typically handled within the ERP system &#8211; based on stock levels and open orders &#8211; CTP takes it a step further: as a function of the APS (Advanced Planning and Scheduling) system, it also factors in production capabilities.<\/strong><\/strong><\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>ATP (Available-to-Promise)<\/strong> checks whether a product can be delivered on the requested date by evaluating current inventory and already scheduled orders.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>CTP (Capable-to-Promise)<\/strong> takes it a step further by also considering production capacity, simulating whether and when a product can be manufactured &#8211; even if it\u2019s not currently in stock.<\/p>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"840\" height=\"700\" src=\"https:\/\/www.dualis-it.de\/en\/wp-content\/uploads\/Unterschied-ATP-CTP_ENG_1920x1600px-1-840x700.jpg\" alt=\"Difference-ATP-CTP\" class=\"wp-image-19541\" srcset=\"https:\/\/www.dualis-it.de\/en\/wp-content\/uploads\/Unterschied-ATP-CTP_ENG_1920x1600px-1-840x700.jpg 840w, https:\/\/www.dualis-it.de\/en\/wp-content\/uploads\/Unterschied-ATP-CTP_ENG_1920x1600px-1-720x600.jpg 720w, https:\/\/www.dualis-it.de\/en\/wp-content\/uploads\/Unterschied-ATP-CTP_ENG_1920x1600px-1-768x640.jpg 768w, https:\/\/www.dualis-it.de\/en\/wp-content\/uploads\/Unterschied-ATP-CTP_ENG_1920x1600px-1.jpg 960w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/figure>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Both functions are vital for <strong>responding to customer inquiries with confidence<\/strong>, <strong>meeting delivery deadlines<\/strong>, and <strong>optimizing resource utilization<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This article explores how ATP and CTP work from a user perspective and how <strong>GANTTPLAN APS <\/strong>seamlessly integrates these capabilities into its APS system.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-left is-layout-flex wp-container-core-buttons-is-layout-b192c3d7 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-outline is-style-outline--1\"><a class=\"wp-block-button__link has-blue-light-color has-blue-light-background-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.dualis-it.de\/en\/products\/ganttplan-advanced-planning-and-scheduling-system\/\" target=\"_blank\" rel=\"noreferrer noopener\">About GANTTPLAN<\/a><\/div>\n<\/div>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">ATP \u2013 Availability at a glance<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">ATP checking is a well-established feature in ERP systems. It determines whether a product can be delivered at a specific time based on current stock levels, open orders, and planned production orders. <strong>However, it does&nbsp;not&nbsp;consider capacities such as machine availability or personnel resources.<\/strong> This means an order may appear available, even if actual production capabilities are lacking.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>ATP (Available-to-Promise)<\/strong>&nbsp;refers to the quantity of a product that can be reliably committed to a customer, based on:<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stock levels<\/li>\n\n\n\n<li>Open orders<\/li>\n\n\n\n<li>Planned production orders<\/li>\n\n\n\n<li>Reservations for other customer orders<\/li>\n<\/ul>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The ATP check is performed at a specific point in time to assess whether a product is available on a given date. It does&nbsp;<strong>not<\/strong>&nbsp;factor in production capacity &#8211; no machine availability, no workforce consideration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>ery scheduled order is automatically ATP-validated<\/strong>, simplifying planning and increasing reliability.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">ATP logic<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The check is based on a net availability calculation:<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>ATP = (stock + planned receipts) \u2212 (reservations + open requirements)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different strategies can be applied:<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>First-come, first-served:<\/strong>&nbsp;Allocation follows the order of incoming requests<\/li>\n\n\n\n<li><strong>Push strategy:<\/strong>&nbsp;Availability is distributed automatically<\/li>\n\n\n\n<li><strong>Pull strategy:<\/strong>&nbsp;Availability is checked on demand<\/li>\n<\/ul>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Limitations of ATP \u2013 A practical example<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">An order may be shown as \u201cavailable\u201d because the material and planned production exist\u2014even though the production machine is down or staff are unavailable.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">CTP \u2013 Can I deliver on day X?<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Despite its widespread use, classic ATP checks in ERP systems have clear limitations. They focus solely on material availability and overlook critical factors like machine capacity and workforce resources. <strong>Without capacity checks<\/strong>, orders may appear deliverable even when production isn\u2019t feasible. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Additionally, ATP logic is based on a <strong>static snapshot<\/strong>, meaning short-term changes in production or supply chains aren\u2019t dynamically considered. In complex system landscapes, this <strong>can lead to overbooking<\/strong> &#8211; especially when multiple systems or manual interventions are involved.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>CTP (Capable-to-Promise)<\/strong>&nbsp;enhances the ATP check by adding a crucial dimension: <strong>production capacity<\/strong>. While ATP verifies material availability, CTP goes further by <strong>analyzing whether &#8211; and when &#8211; a product can actually be manufactured<\/strong>. It considers:<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Material availability<\/strong><\/li>\n\n\n\n<li><strong>Machine capacity<\/strong><\/li>\n\n\n\n<li><strong>Workforce resources<\/strong><\/li>\n\n\n\n<li><strong>Existing production plans<\/strong><\/li>\n<\/ul>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">CTP combines <strong>material and capacity checks<\/strong> in a single, integrated process. It simulates a company\u2019s <strong>actual production capabilities<\/strong> and, if needed, can <strong>automatically suggest new production orders or reallocations<\/strong> to fulfill customer demand.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">CTP logic<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">CTP operates on a <strong>dynamic planning view<\/strong>. It accesses <strong>production planning systems (e.g., APS \u2013 Advanced Planning and Scheduling)<\/strong> and takes into account:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Available capacities<\/strong> (machine uptime, shifts, maintenance windows)<\/li>\n\n\n\n<li><strong>Production routes and lead times<\/strong><\/li>\n\n\n\n<li><strong>Material flows and delivery schedules<\/strong><\/li>\n<\/ul>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">CTP in Action \u2013 A practical example<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">A customer places an order for a product that\u2019s currently out of stock. The CTP check identifies that both material and machine time will be available in three days\u2014and returns this as a<strong> realistic delivery date<\/strong>.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">How GANTTPLAN applies CTP<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">In <strong>GANTTPLAN APS<\/strong>, CTP checks are performed using&nbsp;<strong>simulation orders<\/strong>&nbsp;or&nbsp;<strong>additional requests<\/strong>. The process works as follows:<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list has-anthrazit-color has-text-color has-link-color wp-elements-71d2c9d411768ec7a18b1ce2416cb2f0\">\n<li><strong>Request from ERP<\/strong>: The ERP system sends a request to GANTTPLAN APS with a material number, asking:&nbsp;<em>\u201cWhat\u2019s the earliest possible completion date for this order?\u201d<\/em><\/li>\n\n\n\n<li><strong>Simulated scheduling in GANTTPLAN APS<\/strong>: GANTTPLAN APS initiates a <strong>simulation run<\/strong>, including an MRP calculation. This considers replenishment times, stock levels, and other relevant factors to enable reliable planning. The order is then scheduled based on both material availability and production capacity.<\/li>\n\n\n\n<li><strong>Feedback to ERP<\/strong>: The calculated <strong>completion date<\/strong> is returned to the ERP system and applied to the customer order.<\/li>\n\n\n\n<li><strong>MRP Run in ERP or GANTTPLAN APS<\/strong>: A material requirements planning (MRP) run is executed &#8211; either in the ERP system or directly in GANTTPLAN APS for faster processing &#8211; based on the simulated completion date. The result of the run, including planned requirements and orders, is then fed back into GANTTPLAN APS.<\/li>\n\n\n\n<li><strong>Final Scheduling<\/strong>: With updated data, GANTTPLAN APS can now schedule the order definitively, ensuring both material and capacity constraints are met.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">This ensures that <strong>CTP checks are both conceptually robust and operationally reliable<\/strong>, thanks to tight ERP integration.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">CTP instead of ATP: Real-time planning with GANTTPLAN<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Realistic delivery commitments<\/strong> through capacity-aware planning<\/li>\n\n\n\n<li><strong>Improved delivery reliability<\/strong> and <strong>customer satisfaction<\/strong><\/li>\n\n\n\n<li><strong>Optimized use of production<\/strong> and <strong>logistics resources<\/strong><\/li>\n\n\n\n<li><strong>Reduced overbooking<\/strong> and fewer bottlenecks<\/li>\n<\/ul>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-left is-layout-flex wp-container-core-buttons-is-layout-b192c3d7 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-outline is-style-outline--2\"><a class=\"wp-block-button__link has-blue-light-color has-white-background-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.dualis-it.de\/en\/products\/ganttplan-advanced-planning-and-scheduling-system\/\" target=\"_blank\" rel=\"noreferrer noopener\">About GANTTPLAN<\/a><\/div>\n<\/div>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Additional requests: Flexibility for short-term customer demands<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">GANTTPLAN\u2019s&nbsp;<strong>additional request<\/strong>&nbsp;feature is a key enabler for CTP scenarios. It allows planners to <strong>flexibly insert extra production orders into the schedule<\/strong> without disrupting the main planning flow.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">There are two types of additional requests:<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list has-anthrazit-color has-text-color has-link-color wp-elements-793304ca452c6d0f1ae542821c6cde2b\">\n<li><strong>Without a deadline:&nbsp;<\/strong>Additional production orders are scheduled into available capacity as soon as higher-priority orders have been completed.<\/li>\n\n\n\n<li><strong>With a deadline:&nbsp;<\/strong>The system attempts to meet the requested delivery date for additional production orders as closely as possible, even if they have lower priority.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion: GANTTPLAN APS combines planning with reliability<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">By combining <strong>automated ATP validation <\/strong>with <strong>simulation-based CTP functionality and integrated MRP feedback<\/strong>, GANTTPLAN APS provides a powerful solution for manufacturers aiming to <strong>improve delivery performance<\/strong>, <strong>reduce costs<\/strong>, and <strong>enhance planning reliability<\/strong>.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-left is-layout-flex wp-container-core-buttons-is-layout-b192c3d7 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.dualis-it.de\/en\/contact\/ganttplan-request\/\" target=\"_blank\" rel=\"noreferrer noopener\">Schedule a GANTTPLAN Demo<\/a><\/div>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Stronger delivery commitments \u2013 less stress in your supply chain In today\u2019s manufacturing landscape, the ability to make reliable delivery commitments is critical for customer satisfaction and maintaining a competitive edge. Two essential concepts that support this capability are&nbsp;ATP (Available-to-Promise)&nbsp;and&nbsp;CTP (Capable-to-Promise). While ATP is typically handled within the ERP system &#8211; based on stock levels<\/p>\n","protected":false},"author":59,"featured_media":18232,"comment_status":"open","ping_status":"open","sticky":false,"template":"template-page-blogpost.php","format":"standard","meta":{"_crdt_document":"","inline_featured_image":false,"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","footnotes":""},"categories":[162,164],"tags":[],"class_list":["post-12606","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-production-planning"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Reliable supply commitment with ATP &amp; CTP in GANTTPLAN APS.<\/title>\n<meta name=\"description\" content=\"ATP &amp; CTP checks in GANTTPLAN APS: Dependable delivery commitments. Stronger supply chain reliability. 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