Definition for program &1, list ID &2, status &3 already exists

What causes this issue?

You want to create an action manager definition for program '&V1&',
list ID &V2&', function key '&V3&'.
However, a definition already exists for this combination.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Change the existing definition or create a definition for the new
combination.

Error message extract from SAP system. Copyright SAP SE.