Symptoms:
When doing a Vendor Bill transfer from Web TimeSheet to QuickBooks, the QuickBooks Integration Manager throws the following error message,

"Unhandled Exception has occurred in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.
This request is not support in the specified qbXML version"
 
Cause:
This error occurs only while you attempt to transfer Vendor Bills. The reason for this behavior is if the version of QuickBooks integration Manager that is installed is not of the same edition as of QuickBooks. For Eg. if QuickBooks version is 10.0 Enterprise edition and during the installation of QuickBooks integration manager you selected QuickBooks Canada edition.
 
Resolution:
Launch QuickBooks integration manager and take a backup of the mappings. Review the Related Items section in this knowledge base below to know more about how to Export (backup) and Import (restore) mappings from QuickBooks Integration Manager. Once you have taken a backup of the mappings, Uninstall QuickBooks Integration Manager from the system and reinstall it with the correct edition of QuickBooks selected and import the mappings back into the application. If the QuickBooks version you have does not state any country specified, it would be recommended to select the US edition of QuickBooks during the installation. If QuickBooks is region specific please select the correct version to be able to integrate both the applications.
 

Related Items:

How do I import or export configuration settings in QBI to a .qbi extension file?