You can maintain the following checking rules in Customizing:
Checking rule for created orders (availability transaction '1'):
This checking rule applies to
manual checks in a created order
automatic checks during order creation
automatic checks when a created order is saved
Checking rule for released orders (availability transaction ‘2’):
This checking rule applies to
manual checks in released or partially released orders
automatic checks during the release of an order
automatic checks when a released or partially released order is saved
The checking rule for backorder processing is defined per plant. It applies exclusively to availability checks carried out in backorder processing.
You define checking rules in Customizing for Checking Control (Customizing for Shop Floor Control , choose