This will set the output on the report the 3 decimal places
SET (NAM=DCPT$LIM, RVL=3, GRP=3)
If you just want to do it for a single value you would probably have to use GETVALS to store the value as a REA and then use the RoundToP(arg1,arg2) numerical function to round it - where arg1 is the number being rounded and arg2 is the decimal precision.
