You are using Product Allocation check in SAP APO.
If you trigger gATP check for sales orders then the 'Material Availability Date' (field: MBDAT) is used in the APO product allocation, even you have customized a different check date e.g. Delivery Date (LFDAT) or 'Goods Issue Date' (WADAT) in the APO customizing for the 'Product Allocation Group'.
SAP Supply Chain Management
SAP SCM APO Global Available-to-Promise (gATP)
KBA , SCM-APO-ATP , Global Available-to-Promise , Problem
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