QB Issue Resolution:

This probably means you have two WC codes with the same name. Try changing the name slightly, such as by putting a 2 at the end of the code’s name.

Resolution for Issue 'Workers Comp Code List Change' available: Yes (Solved).
Source: Intuit Community forum.

Workers Comp Code List Change: 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 codes name.
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Error Recovery for codes name. [Canada]
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