issue is related to wm and qm .
this is the issue ,
Store do GR, Material route for QA Inspection. After QA Usage Decision
make, WM post change number generated. Material will be at 922-TR Zone
interim area pending for post change to be completed.
When there is another GR, QA Inspection and Usage Decision done for the
same material(i.e. where there is same material existing in 922 interim
area), system will assigned the same quant for the material. This
causes error while store trying to complete the post change for the
second material who having the same quant.