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this is the expression, sum(Billed)-Before(sum(Billed))
I hope someone can help.
May be this
Alt(Sum(Billed)-Before(Sum(Billed)), 'N/A')
Or this
If(Len(Trim(Sum(Billed)-Before(Sum(Billed)))) = 0, 'N/A', Sum(Billed)-Before(Sum(Billed)))
ALT function worked - THANK YOU!