I got the following Error when I validate the report (cognos 8.4.1, DB: SQL server)
OP-ERR-0144 Grouping on a property or property expression:
Can you share your thoughts, if any, on this...?
Is this by any chance an (straight) upgrade from ReportNet to Cognos 8.4?
migrated from 8.3 to 8.4.1
I am also getting the same error and also upgraded from 8.3 to 8.4.1. I'll post the solution once I find it.
:)