Call object could not be linked to note (&1 - see long text)

What causes this issue?

The call could not be linked to the note. There are a number of
possible causes:
1001 - document is not available
1002 - document is already available as attachment
1003 - user has no authorization for selected operation
1004 - combination of parameter values is not permitted
1005 - error occurred in function module
1006 - selected document class cannot be created here
1007 - document is already being processed - function not possible

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

System Response

The note is created without the call object and saved in the selected
folder

Error message extract from SAP system. Copyright SAP SE.