In ME21N, purchase order creation,
after enteriang all details material etc. when enter key pressed,
material field becomes inactive.
But the order is created and saved.
Material entry also created in table EKPO.
This occurs only when Document Type is SB and Item category S.
Is there any bug in program or customizing or any relavant SAP note, table entry missing.
It happened during upgrade from 4.6 to ECC 6.
Thanks In Advance.