problem in conversion

Hi,

i m facing a prolem i m having one quantity having value in

metric tone but i want this quantity in KL , so i m dividing it by density (GML)

for this i changed the unit to KL for my unit field as i want it in KL .

now i i put the routine to divide

<b>quantityMetric tone) / quantity(GML)</b>

its giving me an error

<b>Arithmetical errors or conversion errors found in routine ROUTINE_0005 record 1432</b>

cud u plz tell y this error is coming

help will be appreciated