Problem with Business Date/Time Function

[Venu_Gollapudi]

Hi,

When I am trying to retrieve week of the year for a perticular date by using the function _week_of_year I'm getting the following error:

RQP-DEF-0177

An error occurred while performing operation 'sqlPrepareWithOptions' status='-126'.  

Also note that the same[_week_of_year] is working for the relational models, but I want the same work for dimensional model for which cube is the data source.

Can any one help on this......

Thanks in Advance.
V.