I was just told to used the overall amount of materials, including the waste or material that is removed from the raw materials and not included in the final product, instead of the actual amount at the final stage/product.

For example,

if I start with full length bar ( qty  =1) but during the machiniing and processcing much of the material gets removed and I only end up with 1/10th of the original length (Qty becomes 0.1) so I used 0.1 in BOM quantity and I guess this caused confusion with materials manager. so she and Engineering manager told me to use 1 as BOM quantity.

Does it make sense and is it standard industry/engineering practice?

btw, I am in Medical Device industry.

Thanks,