Error after importing a Universe in UDT 4.1

Hi Gurus,  We are migrating from SAP Business Objects 3.1 to 4.1 and testing Universe in UDT 4.1.  On importing one of our Universe, we get an error message -

"Exception: DBD, [Microsoft][SQL Native Client][SQL Server]Conversion failed when converting date and/or time from character string.State: 22007". 

How can what steps can we take to investigate and resolve it.

Thanks. 

Rish