Bom Explosions

Hi Gurus.I have one prob.please solve this

I have noticed that the transactions CS11 and CS12 (and possibly some

other transactions) appear to round up the quantity for each material to

the next largest whole number. This can cause some problems when trying

to capture costs. There are times in BOMs that the quantity is a small

fraction, but will show up in the explosion as a whole number. Please tell me why SAP is behaving

like this? And if so, what is the business reason to round up the

quantities used? We would rather see the quantities reflected as the

actual quantity loaded in the BOM to eliminate the possibility of

improperly costing a material.