While i am creating PO Via ME21N -
I created PR, that having material group like GVM0 which is in SAP tables.
But while converting PR to PO through ME21N throwing to basket its changing material group automatically like GVN0 but this value is not having any SAP database table and getting runtime error.
Its callaing FM 'T023_SINGLE_READ' .
This FM only changing material group automatacally.
I don't know how its changing automatically.
Kindly anybody help me