From Sage - close but possibly not directly on point:
Description
""Data files for XXX have not been converted. You must convert before activating."" (XXX = company code) occurs when activating or copying a company in a Sage 100 installation with third party modifications
Disclaimer
Backup Warning
Use caution when working with the below product functionality. Always create a backup of your data before proceeding with advanced solutions. If necessary, seek the assistance of a qualified Sage Business Partner, network administrator, or Sage Customer Support Analyst.
Support
Sage Customer Support does not provide assistance for issues related to third party products or enhancements, hardware, report customizations, state or federal tax-related questions, or specific accounting questions. Please contact your Sage Business Partner, network administrator, or accountant for assistance. Please review this document for additional information on the scope of Sage Customer Support Services.
Cause
This error is caused by the installed modifications. The master developer who created the enhancement should be contacted to report the issue.
Resolution
Copy the MAS_SYSTEM\SY_EnhancementModule.M4T file to a directory outside of the MAS 90 directory.
Expand Modules, Library Master, and Utilities. Double-click Data File Display and Maintenance.
In the File Name field, select the SY_EnhancementModule.M4T file.
Click the Delete button to delete all records in this file one by one.
Rename the ...\MAS 90\Links folder.
Create a temporary Links folder and copy the default.pvc file from the old Links folder.
Proceed with the copy or activation process.
Delete the temporary Links folder, and rename the original Links folder (to Links in the \MAS 90\ directory).
Delete the ...\MAS_SYSTEM\SY_EnhancementModule.M4T file and restore the original file (from the backup created in previous steps).