I try this expression without the dimension reason for every distinct reason:
=round(Count({<Cancellation_Order_Reason_Detail={'CAUSA DI FORZA MAGGIORE'}>}Cancellation_Order_Reason_Detail)/Count({<Macro_Tec-={'LTE'}>}Order_Number),0.01)*100&'% ('&Count({<Macro_Tec-={'LTE'}>}Order_Number)&')'
It works, but in this way I lost the dynamic list of reason dimension. So I can't use this solution!
Can you suggest a solution without losing the dynamism of the REASON dimension list?