Using 'within set'

[DhimanBiswas]

Hi friends,

I have one doubt here; please help.

Attached is a chart that I have created. Package is of DMR nature.
Series has a column called [Source of Feedback] where a slicer is applied to display only [CFPB] and [FRB] members. Additionally I need to display CFPB% as ( complaint volume for CFPB / complaint volume for CFPB across all quarters selected ). I am not able to find the expression for the denominator here.

What I used is:

_format (  (  total ( [Complaint Volume] within set [CFPB] ) /  total ( [Complaint Volume] for report )  ), PERCENTAGE_2 )

which is not right.

Can you please help me get the right expression?