MultiCube Queries - Inventory

I have built a multicube which includes the daily load inventory cube and a snapshot inventory cube. The idea for this is that I am building a workbook which will include the daily stock overview query and a monthly stock overview query.

In order to show the daily load as part of this workbook I have had to add the 0CALDAY time characteristics. In the monthly stock overview we want to select fiscal periods time dimensions (which we have included in the multicube) is this feasible if so how and is there any impact because we have 0CALDAY granualarity? Thanks