Numeric overflow computation error - response (2) by Qaisar Aftab Kiani

BTW you are multiplying DECIMAL(8,4) * DECIMAL(3,3) * DECIMAL(5,2). So I think your result should be DECIMAL(16,9) or something like that.
MAXDECIMAL flag in DBSControl also controls the maximum number of digits in a DECIMAL result for an expression. It could be 15 or 18, so if this is 15 then probably your computation won't be successfull.