Error Output Or Input-output Parameter In A User-defined Function. (6023) (100)


Using ancient, obsolete and unsupported Progress 9.1d... Can anyone help identify what types of things would be causing this error I found in my logs? It's cut off right in the log so I don't know what the rest says. I couldn't find anything specific in the progress kb either.

"10:31:09 SQLSRV2 6: gger for an OUTPUT or INPUT-OUTPUT parameter in a user-defined function. (6023) (100)"