In addition, the customizing setting " ATP Confirmations Relevant for MRP" on the customizing activity "Assign Delivery Type and Checking Rule", which is under the stock transfer customizing, allows you to controls the system behavior.
The F1 help of this customizing setting provides the following information:
"If the supplying plant cannot confirm the entire requested quantity,
the system issues an error message that you can configure in
Customizing (MEPO 155, System Messages) and you cannot save the
related documents. Therefore, only select the checkbox if you have
configured the availability check so that the system generates the
appropriate confirmation schedule lines for all request schedule
lines. This is the case, for example, if you run the availability
check with replenishment lead time."
BR
Caetano
