I have tried via BRFPLUS derivation for entity BP_HEADER where I am facing an error as
USMD7 014 - Key was modified during derivation of entity type.
I have tried the cross entity derivation where while writing the key entity, I am facing a error as USMD1A 061
&1 &2 currently not in process and an exception cx_usmd_write_error occurred
&1 is Business Partner ID.
Is there any other way to achieve this.