3782802 - Warning message AG800 "Incorrect setup of table ATPMATX" during sales order ATP check

When performing an action in a sales order that re-runs the ATP check (for example, changing item quantity), a warning message AG800 "Incorrect setup of table ATPMATX" appears.

SAP S/4HANA Cloud Public Edition

1. Open an sales order.
2. Change an item quantity (or perform any action that re-runs the ATP check).
3. Press Enter or update the document.
4. Observe warning AG800: "Incorrect setup of table ATPMATX".

Plant level MRP area is not existing for the current plant, which prevents the system from fully building the expected ATP context and resulting in warning AG800.

Maintain the MRP relevant data in the material master data for current plant. Once maintained, a Plant Level MRP Area with the same name as the plant will be automatically generated and the warning message will disappear.

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