Pricing Formula - QP_Custom - How to get List_header_id

Hi Pricing Guru's

We have below scenario

Product ABC --> has 3 different accruals (3 different calculations)

We are using 1 pricing formula - QP_Custom function to perform required calculations and get the required %.

The challenge we are finding:

All 3 modifiers qualify for a given order --> it is expected behavior.

Since all 3 modifiers have same formula id -- when we do "p_req_line_attrs_tbl"  --> all 3 list_header_id's are showing up.  Not sure how to select one list_header_id at a time.

As per my understanding during pricing engine call -- QP_custom will be called once for each modifier --> Modifier Id should be available to capture as input parameter, calculate and provide output for respective list_header_id / List_line_id combination.