I was trying to find any existing expression types in BRF plus which can be used for searching BPs. I can see EXTY_CRM_BP_READ which can read BP data but none to search for BP by passing search parameters.
I found a class CL_CRM_BRFP_WD_BP_READ_MODEL which has description to search for BPs but can't see it implemented in any expression type. I am looking for something similar to BOL Query BuilHeaderSearch in BRF+.
Do you have any documentaton to create your own expression types.