He update the code as below:


A more robust solution:

STORE EVALUATE(MAX(ALLTRIM(EVALUATE("m.HMF" + PADL(ALLTRIM(STR(nCounter)),2,"0"))), " 0")) TO nValue

It can safely handle formulas like these, that the first version couldn't:

HMF01 = "(m.KHour * 1100000) / 110 "
HMF02 = " 110000"
HMF03 = ""