QB Issue Resolution:

If you could, and you can not, change inventory or assembly items to non-inventory you would change the whole history of the file

My client set up their items with the sales gl number in the expense area and vice versa. I have been able to change most of the items but there are some that are marked inv assy and I cannot change that to non-inventory items. If I try to change the gl account numbers it effects my prior years financials

If last years financials used an expense account when an income account  should have been used (and visa versa)

your last years financials are wrong any way.  As is your tax filing for last year

Resolution for Issue 'How can I change inv assy items to non-inventory and/or the general ledger accounts in the items without effecting prior financial reporting?' available: Yes (Solved).
Source: Intuit Community forum.

How can I change inv assy items to non-inventory and/or the general ledger accounts in the items without effecting prior financial reporting?: 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.

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