When you save a confirmation for a finished product in repetitive manufacturing, the system performs the following actions by default12:
Posting of production costs to the production cost collector: The system calculates the actual costs for the confirmed quantity and posts them to the production cost collector assigned to the product. The production cost collector is a cost object that collects the costs for all confirmations of a product in a plant for a period.
Posting of goods receipt for the product: The system posts the confirmed quantity as a goods receipt to the warehouse. The product is valuated at the standard price defined in the material master record. The difference between the standard price and the actual costs is posted to a price difference account.
Reduction of associated capacity requirements: The system reduces the capacity requirements for the work center where the confirmation was made. The capacity requirements are calculated based on the confirmed quantity and the standard values for setup, machine, and labor time in the routing. Reference: 1: Repetitive Manufacturing Confirmation | SAP Help Portal(https://help.sap.com/docs/SAP_S4HANA_ON-PREMISE/ee6ff9b281d8448f96b4fe6c89f2bdc8/66dd7fc2d4ac4a53b51f300a04ae24ac.html)2: Confirming Production in Repetitive Manufacturing | SAP Help Portal(https://help.sap.com/docs/SAP_S4HANA_ON-PREMISE/f899ce30af9044299d573ea30b533f1c/9231f9504a62eb5ee10000000a44538d.html).

Dependent requirements are the requirements for components that are derived from the requirements for the finished product or assembly. They are created when an independent requirement is created for the finished product or assembly, such as a planned independent requirement, a sales order, or a stock transport order. They are also created on assembly level during the planning run, when the system explodes the bill of material (BOM) of the finished product or assembly and calculates the requirements for the components based on the BOM structure and quantity. Dependent requirements can be created for multilevel or single-level BOM structures, depending on the planning strategy and the BOM explosion level. Reference: Dependent Requirements | SAP Help Portal, Material Requirements Planning (PP-MRP) | SAP Help Portal.