conditional format for simple measure

Hi All

I need to add $ or the euro sign to measure value  depending on current measure of the currency dimension.

I can write an iif() expression at the format_string clause of a calculated measure of course

But this requires the creation of calculated measure for each simple measure i need to format...

Is there a way to write the iif() expression in the format string property of an original physical measure?

TIA

Rea