Characteristic Relationship Exit - on DSO

Hello Gurus

We are on BW version 7.4 SP09 and we are using Commenting solution on DSOs.

At one aggregation level, i don t have 0FISCPER, but i have 0CALQUARTER, and i am trying to derive first period of entered quarter, by an exit.

i.e. if Calquarter = 3.2014 then Fiscper = 009.2014.

So i have a query on this aggregation level, that i can enter forecast amount and its comment. I save amounts to an infocube and comments to a DSO.

This exit above, works perfectly on infocube. But not on DSO.

Is there any rule that i am missing, what do you think about it?

Thanks in advance for all your comments.