Receiver function module & not found

What causes this issue?

The specified <DS:GLOS.3526B12EAFAB52B9E10000009B38F974>receiver
function module</> was not found in any function group.

System Response

The action was terminated, an event was not triggered.

How to fix this error?

Check whether the specified receiver function module actually exists
and has been activated.

Error message extract from SAP system. Copyright SAP SE.