There is no BOM in QBO at all.

QB requires a work around to post landed costs to the items purchased

enter the bill for the items you are paying for using the item detail part of the expense screen – that stocks the item with an initial cost and qty

create an […]

Resolution for 'costs applied issue: 'Accounting for duties in cost of goods sold and final item cost' available: Yes.

The costs applied issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the costs applied issue yourself by looking for a resolution described in the article. If it is a complex costs applied issue or you are unable to solve the issue, you may contact us by clicking here or by using other costs applied support options.

For more information about resolving issues related to costs applied in Quickbooks/QBO or to get support for the issue 'Accounting for duties in cost of goods sold and final item cost', click the link below: