Return Po Quantity is more than actual Po quantity

Hi All,

While creating Return STO PO the quantity is allowing more then normal STO Po quantity.

Example :

1.Sto PO qty : 10, obd :10 qty, pgi :10 qty, migo :10 qty, miro :10 qty...

Return Sto PO :

1. Return sto po : 15 qty ( system allowing to create more quantity). obd : 15 qty. pgi : 15 qty and migo : 15 qty ( If the material is having stock, we can create GR, if the material don't have stock its giving general error like don't have stock in plant)..

Please help on this..

Thanks