Develop BOM query report using API

Hello Experts, 

    We usage API_BILL_OF_MATERIAL_SRV_0002 to make BOM query report. We find that we indispensable input "BillOfMaterial" (bomid) .But wherever volition we cognize the ID erstwhile querying? We anticipation to query by worldly number.We besides couldn't find an API to query bomid by worldly number.

B.R

John Huang