lock object – SAP EWM Help https://www.sapewmhelp.com SAP EWM questions answered by experts — ABAP, S/4HANA, warehouse management Thu, 31 Jul 2025 15:19:34 +0000 en-US hourly 1 https://wordpress.org/?v=7.0.2 Concurrency Control: eTag ( Optimistic ) https://www.sapewmhelp.com/question/concurrency-control-etag-optimistic/ https://www.sapewmhelp.com/question/concurrency-control-etag-optimistic/#respond Thu, 31 Jul 2025 15:19:34 +0000 https://www.sapewmhelp.com/?question=concurrency-control-etag-optimistic Concurrency in SAP RAP (RESTful ABAP Programming Model) refers to handling situations where multiple users try to modify the same data simultaneously — a classic case of the “lost update problem.”

SAP RAP provides built-in mechanisms to ensure data consistency, conflict detection, and safe updates, especially in Fiori apps or other UI/front-end scenarios.

We need to add the fields like timestamp in the database table.

Book table –>  changedat

Then add the annotation in the CDS view Entity –> interface

Now add eTag in the Behavior Definition

And use the eTag in the Behavior projection

Output : when 2 users try to modify the same data fields at same time.

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