How To Fix WRF_AT_GENERATE027 - Server group does not exist, therefore processing with an empty group

SAP Error Message - Details

• Message type: E = Error

• Message class: WRF_AT_GENERATE - Messages: Allocation Table Generation RTFASH/Ordering

• Message number: 027

• Message text: Server group does not exist, therefore processing with an empty group

What causes this issue?

An error occured while determining the existing resources for the server
group specified on the selection screen.
You entered a server group that does not exist on the selection screen.
In this particular case, processing (including the new resource
determination) takes place with an empty server group. This is as if you
did not specifiy a server group on the selection screen.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.