Creating Multi-Level Fixed Pegging Relationships Manually 
You can also use the heuristic SAP_PP_019 on a multi-level basis, to create a complete pegging structure across all BOM levels of a product. In this way, you can define the material flow, starting with an independent requirement, such as a sales order, through to the receipt elements for raw materials.
To be able to create multi-level pegging relationships you must include the heuristic SAP_PP_019 in the MRP heuristic SAP_MRP_001. Before the creation of fixed pegging relationships, the heuristic SAP_PP_011 (Deletion of Fixed Pegging Relationships) can be carried out so that you have an exact overview of fixed pegging relationships.
Prerequisites
You have set the indicator Pass On Independent Requirements Information in the heuristic settings for the heuristic SAP_PP_019.
Procedure
Change the heuristic settings for the heuristic SAP_MRP_001 —Product Planning (Comp. acc. LLevl Code), by choosing Other Heuristic and entering SAP_PP_019 in the Heuristic field or create a new heuristic on the basis of the MRP heuristic.
Call the production planning run and define the following processing steps:
01 SAP_PP_011 — Deletion of Fixed Pegging Relationships
02 SAP_PP_020 — Determination of Low-Level Code
03 SAP_MRP_001 — Product Planning (Comp. acc. LLevl Code)
As the planning objects, choose the products for which you want to generate a pegging structure.