You're using standard requirement strategy or copy of them (refer to SAP Note 1241642), but you replaced the category group with a customizing one, in which only delivery category (BR) is included while sales order category (BM) is not included. Forecast consumption does not happen when sales order is created, and happens when delivery is created which is as expected. However forecast reduction does not happen after PGI, which causes no withdrawal quantity is logged and forecast quantity comes back after PGI.
SAP Supply Chain Management (SCM)
SAP Advanced Planning and Optimization (SCM-APO)
SAP enhancement package for SAP Supply Chain Management
SAP Supply Chain Managment Demand Planning (SCM-APO-FCS)
KBA , SCM-APO-FCS-CSP , Forecast Consumption , How To
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