In a DB2® for z/OS® database, only one version of a native SQL procedure can be active at a time. When you create a procedure, it is the active version. The active version of a procedure is shown as a procedure node in the Server Explorer.
When you create a version of a procedure, it is an inactive version. It does not become the active version automatically; you must make the version active. All of the inactive versions of a procedure are shown under the Versions node of the procedure.
To make a native SQL procedure version active:
In the Server Explorer, the version of the native SQL procedure that you make the active version replaces the previously active version as the procedure node. The previously active version of the procedure is moved under the Versions node of the procedure.
Developing IBM Database SQL and SPL Procedures | Creating Versions of Native SQL Procedures | Managing Procedures, Functions, and Objects