SAP Message WRF_AT_GENERATE027 - Server group does not exist, therefore processing with an empty group

Diagnosis An error occured while determining the existing resources for the servergroup 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 resourcedetermination) takes place with an empty server group. This is as if youdid not specifiy a server group on the selection screen.