Personnel number & invalid

What causes this issue?

The personnel number &V1& entered is not valid at posting date &V2&.


&TECHNICAL-INFO&
When checking the personnel number, the system found the following
error : "&V4&" (error message no. &V3&).

How to fix this error?

Enter a valid personnel number.
If you do not want the system to check the personnel number in CO, you
can switch off this error message or change the message type (in
Customizing). To do so, see the "General Controlling" section of the
IMG and the activity <DS:SIMG.SIMG_CFMENUORK3OBA5>"Change Message
Control"</> (work area "KI", message number "211").

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.