What will happen in the MRP run if you have created a new MRP-relevant material...

 If you have created a new MRP-relevant material that supports both in-house production and external procurement, you need to specify the procurement type for the material in the material master record. The procurement type determines how the material is procured, either in-house, externally, or both. If you do not specify the procurement type, the MRP run does not consider the material, and it has to be planned interactively using the MRP Live app or the MD04 transaction. In interactive planning, you can manually assign a procurement type to the material and create the corresponding order proposals, such as planned orders or purchase requisitions. Alternatively, you can maintain a production version for the material, which defines the procurement type and the BOM and routing to be used for in-house production or external procurement. The production version can be assigned to the material in the material master record or in the MRP Live app or the MD04 transaction. The production version allows the MRP run to plan the material automatically based on the specified procurement type123. References: Procurement Type | SAP Help Portal, Production Version | SAP Help Portal, Material Requirements Planning with SAP S/4HANA, page 79-80.