Error in report studio when Validating

[johny.cbi]

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...?

[blom0344]

Is this by any chance an (straight) upgrade from ReportNet to Cognos 8.4?

[johny.cbi]

migrated from 8.3 to 8.4.1

[mfifa]

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.

:)