Diagnosis
You attempted to copy a material assortment but the target assortmentwas not completely empty.
There may still be listing conditions or assignments to modules(possibly empty ones) defined for the assortment.

System Response
INCLUDE ISR_STOP

Procedure
First, delete the existing material assortment.
Check whether a transaction to delete the assortment was started ashort time ago and is not yet fully posted - that can also cause thissystem message.