Non severe error - List report

[cognosun]

We have simple list report ( detail report ) which runs fine if we run it directly.

But when we run it via drill-through from another report ( summary report) we are getting below error:

"SQL0901N The SQL statement failed because of a non-severe error"

We are on Cognos 8.4 and DB2 9.

Interestingly there is not much info about his error on internet...great if someone give any inputs.

Thanks in Advance.