Where is the low-level code for material planning sequence stored in SAP S/4HANA?

The low-level code for material planning sequence is indeed stored in the MRP planning file. This planning file contains critical information for material requirements planning (MRP) processes in SAP S/4HANA. The low-level code is essential as it indicates the hierarchical position of each material in the planning sequence, allowing the system to determine how materials are dependent on one another in the production process.

When MRP is executed, the system uses this planning file to identify which materials need to be planned, based on the requirements generated from both demand and inventory levels. It helps in establishing production schedules and procurement activities effectively. The other options, such as routing, bill of material, and purchase order, serve different purposes in the production and procurement process, but they do not specifically house the low-level codes utilized in MRP planning. Routing focuses on the sequence of operations for manufacturing, bill of material lists all of the components required for a product, and purchase orders are transactional documents for procuring goods, rather than planning sequences.