Resource &1 in operation &2 does not meet resource selection conditions

What causes this issue?

You want to plan or release operation &V2&.

System Response

Selection criteria are available for resource &V1& of the operation.
The characteristics of the resource (classification) do not meet these
selection criteria.

How to fix this error?

Change the rfesource in operation &V2&.
The function 'Resource selection' considers the selection conditions.

Error message extract from SAP system. Copyright SAP SE.