PL look at your last inventory part item in BOM. You need 6 quantity to build whereas you have only 1 quantity on hand.

That’s why the build shows maximum number you can build is 0.16666

Resolution for 'Assembly Problems issue: 'Assembly Problems: Main Assembly is shorting inventory in sub assemblies.' available: Yes.

The Assembly Problems 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 Assembly Problems issue yourself by looking for a resolution described in the article. If it is a complex Assembly Problems issue or you are unable to solve the issue, you may contact us by clicking here or by using other Assembly Problems support options.

For more information about resolving issues related to Assembly Problems in Quickbooks/QBO or to get support for the issue 'Assembly Problems: Main Assembly is shorting inventory in sub assemblies.', click the link below: