Diagnosis
You want to create a batch for material &V1&. None of theexisting batches of the material are classified. The material &V1& or a batch of this material is currently being processed in anothersession. To ensure that a batch is not assigned to a different classfrom the material or that two batches of the material are not assignedto different classes, you cannot create any batches for material&V1& as long as the material or one of the batches of thematerial is being processed.

Procedure
Finish processing material &V1& or a batch of this material inone of the parallel sessions.