Create a customer product mix calculation key figure

Hi Experts,

Objective: Create a customer product mix calculation key figure

Step 1: Created a planning level PERCUST

Step 2: Added a calculation level in CONSENSUSDEMAND key figure (CONSENSUSDEMAND@PERCUST = SUM("CONSENSUSDEMAND@PERPRODCUST)

Step 3: Created a key figure with calculation ZKFCUSTPRODMIX@PERPRODCUST = "CONSENSUSDEMAND@PERPRODCUST"  / SUM( "

CONSENSUSDEMAND@PERCUST" )

It returns the following error "The planning level used for the output key figure should be a subset of the input planning level."

Any alternate way of doing this?

Regards,

Aditya G