Udf Run time calculation problem

Hi

I create 3 UDF in Row Level and Create 1 UDF at Header Level

I want to Calculate 3 Row' Level UDF Run time values Total Store in Header Level UDF

I try This Quarry

SELECT SUM(CAST($[$38.U_BED.11] AS INT)) + SUM(CAST($[$38.U_HEDU.11] AS INT)) + SUM(CAST($[$38.U_EDU.11] AS INT))

BUT ITS NOT WORKING