The following actions are needed for outsorting:
1. Define check list validation
2. Define outsorting chech group
3. Define checks
4. Create function module (ISU_VAL_******)
Regarding to this I've two questions:
1. When is a custom outsorting check really active?
Is the check automatically active after setting the customizing settings specified above and the creation and activation of the function module or should it be activated somewhere else.
2. What happens during billing or invoicing when you define checks in customizing but didn't create or activate the function module?