You have just confirmed intermediate activities for a production order.

Comprehensive and Detailed Explanation From SAP S/4HANA Cloud Public Edition, Management Accounting documents:

In event-based production accounting, financial postings occur immediately upon the recording of operational events, such as activity confirmations12.

Direct Production Costs: Confirming labor or machine time triggers a direct activity allocation, which posts the actual costs of those activities to the production order13131313.

Overhead Calculation: Immediately following the activity confirmation, the system automatically calculates and posts overhead costs to the order based on the defined costing sheet14.

WIP Posting: Because the order is still in progress, the system recalculates and posts the Work in Progress (WIP) to reflect the value of the work performed so far15.

Settlement and variance calculations do not occur at this stage; they are only triggered when the order reaches a final status such as "Delivered" or "Technically Completed"16.