1. A method for computing modified low level codes (LLC) for part numbers throughout a bill of material (BOM) supply chain, comprising the steps of: identifying part numbers that share a same capacity resource but cannot be made to have a same LLC due to a BOM material restriction, wherein the part numbers which cannot be made to have the same LLC due to the BOM material restriction are oscillating part numbers (OPN); identifying a highest LLC within the part numbers that share the same capacity resource except for the OPN; adjusting the LLC for the part numbers that share the same capacity resource, excluding the OPN, to the highest LLC such that the part numbers which share the same capacity resource have a same LLC; and recalculating the LLC for part numbers which violate BOM dependencies by going through the entire BOM supply chain, the recalculated LLC is higher than or equal to the highest LLC provided in the adjusting step for each capacity resource, wherein the adjusting of the LLC to the same LLC permits part numbers at different levels of the BOM which share the same capacity resource to be treated at a same level of the BOM in order to sequence the part numbers for resource allocation.