EPMDimension Override context property issue

Hi Experts,

I want to make an expansion with an EPMDimensioOverride that gives me all the basemembers of one member filtered by one property ( S_CENTRO) that should be equal to the context of another dimension (CENTRO).

I tried the following but it doesn't work:

EPMDimensionOverride("000";"SERVICIO";BAS(S_0) AND S_CENTRO=CONTEXT.CENTRO)

I can not relate the "CONTEXT" with the dimension I want to reefer.

I attach one picture that shows the way I will do this report in the "Report editor"

Thank you in advanced.

Álvaro.