Diagnosis
You are trying to create a batch for material &V1&. Of theexisting batches of this material, only batch &V3& has beenclassified in plant &V2&. This batch is currently beingprocessed in another session. To ensure that both batches cannot beassigned to different classes, you cannot create any more batches formaterial &V1& as long a batch &V3& is being processed inplant &V2&.

Procedure
Finish processing batch &V3& of material &V1& in plant&V2& in one of the parallel sessions.