Sorry Frederic!
Please provide the REAL names of ACCOUNT, DATATYPE and other dimension members.
What source you want to copy?
What condition you want to test?
Where you want to copy the result?
In general, ternary operator works like:
A==B ? C : D
If A=B then write to destination C, else D
Tuple is the intersection definition like:
([DIM1].[MEM1],[DIM2].[MEM2],[DIM3].[MEM3])
surrounding brackets for tuple - required!
With ternary operator if for some condition you want to write nothing - then write destination over destination.
Hope it's clear!
Vadim