>>I haven't figured why I was getting different results, but I decided to move on.
>
>Check COUNT(*) vs COUNT, are they equals.

I can not reproduce this problem now.

 SET ORDER TO com_inv IN comision
                IF SEEK(m.ccinv + m.Slsman)
                	
					*SUM (rate*SHARE/10000) TO cRate WHILE inv_no+salesman = m.ccinv + m.Slsman
					SELECT SUM(rate*SHARE/10000) AS crate WHERE inv_no+salesman = m.ccinv + m.Slsman ;
                	FROM comision INTO ARRAY laArr
*!*	                	IF NOT m.cRate == laArr[1]
*!*	                		=MESSAGEBOX("Found a mismatch on " + m.ccinv + m.Slsman)
*!*	                		_cliptext = _cliptext + "Found a mismatch on " + m.ccinv + m.Slsman + " cRate = " + ;
*!*	                		         	TRANSFORM(m.cRate)  + " laArr[1]= " + TRANSFORM(laArr[1])
*!*	                	ENDIF
                	cRate = laArr[1]	         	
				ELSE && Not found
					cRate = 0
				endif	

With SEEK before select both return the exact same amount.