Relative Time Categories - QTD Grouped

[san26]

Hi,
Could any of you help me out with QTD Grouped function in
Relative Time Categories - My current requirement has date
dimension in the cube where month is the lowest level(we use
calendar date as the lowest level inorder to keep the uniqueness
issue in place,but we keep it supressed).So as per the user
requirement we are supposed to able to give them MTD Grouped,QTD
Grouped and YTD Grouped.All the values are coming up correct
except QTD Grouped(we are able to solve this issue if we include
week as the lowest below the Month level/inother words if we
keep the lowest levels unsupressed),but the user group is not
ready to see week in there analysis/dimension.

So i would like to know if there is anyway we could solve this
issue without having to include any other lower levels except
month in the time dimension?

Any help/suggestion in this regards is greatly appreciated.

Thanks,
Shweta