Hello,
Can you share the syntax of your formula?
For example:
=EPMMemberProperty("Connection_Name","Member","Property")
=EPMMemberProperty("BHP_FINANCE","ACCOUNT:TAX_RATE","SOURCE")
So this is my Finance Connection, the Member "TAX_RATE" from my Account dimension, and the property "SOURCE" which is a property of my Account dimension. The result is "M".
(Defining the dimension isn't always necessary, but if you have the same name among dimensions, it may show Ambiguous Member error.)
Thanks,
Alexander