Diagnosis
You have chosen an availability check without simultaneously switchingon the transfer of requirements. This is not allowed at requirementsclass level.

System Response
The system therefore issues an error message.

Procedure
Choose the transfer of requirements. If you want to perform theavailability check without transfer of requirements, do so atschedule line level. For transactions such as inquiries and quotationsit makes sense to carry out the availability check without the transferof requirements.