Hi,
Sorry, FM BBP_BD_PDDOC_FROM_BAPI_MAPS is used in report transfer not SOA.
For SOA, you may check the following method:
METH
/SAPSRM/CL_CH_SOA_DO_MAP_ATCHF
/SAPSRM/IF_CH_SOA_DO_MAP_ATCHF~CREATE
For SOA, it is transferred with XML. You can try to transfer PR by adding attachment GOS in header to see if outbound XML can be generated. If so, you can check SRM side to see where the restriction is.
best regards,
Ivy