QB Issue Resolution:

issue the credit memo and return the goods to inventory. then do an inventory adjustment and charge the item to an account called “Breakage” or “Defective”

Resolution for Issue 'How should I enter a credit memo without effecting inventory?' available: Yes (Solved).
Source: Intuit Community forum.

How should I enter a credit memo without effecting inventory?: 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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