QB Issue Resolution:

You are using QBO?

there are no assembly items in QBO at all, I can not imagine why that terminology even exists in a warning in QBO

If you are using desktop on the other hand, check your pending build report, also check the item tab on the purchase, you may have recall previous transactions set to on in preferences, and an assembly item is being pulled to the item tab when you are using the expense tab – if so click on the assembly item and use menu edit>delete line

Resolution for Issue 'There is a problem with the assembly items from this transaction warning' available: Yes (Solved).
Source: Intuit Community forum.

There is a problem with the assembly items from this transaction warning: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for assembly items
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