PLD batch quantity variable

Dear Experts,

I am printing a delivery document with batch numbers , I have the batch quantity as variable 494, this displays with 6 decimal points

i.e. if qty is 6 it displays as 6.0000000 when I apply the round function Round (F_115,2) nothing is displayed. It all disappears, I would like to display this quantity value in 2 decimal places i.e. 6.00. How would I go about this ?