Search &1 already exists for search type &2: &3

What causes this issue?

The search you entered already exists for another
<DS:DE.IGN_SEARCH_CATEGORY>search category</> .
The key of a search, comprising search application and search, must be
unique.

System Response

You cannot create a further search with the same key.

How to fix this error?

Perform one of the following activities:
Enter a different key for the search
Delete the existing search with the same key

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.