Hi BNR,
can you try to send the PIR via /SAPAPO/DMP2.
have you mentioned the requirement Type and version in the transfer profile?
also check
If you are not using 9ALOCNO and 9AMATNR as your characteristics for Location
and Material you must assign the characteristics you are using for Location and
Materials to the Planning Object Structure in /SAPAPO/MSDP_ADMIN. Open the
PLOB and in Edit->Assign Product/Location enter the characteristics