Cause

A GUID with the same value <x> exists at more than one main function in the project. Each main function must have a unique GUID to allow the project export to AutomationML.

Solution

1. Locate the main functions that have the GUID that has been assigned several times in the project by using the Go to (graphic) or Synchronize selection functions offered by the popup menu of the Message management dialog.
2. Call up the property dialog respectively for each main function.
3. Assign a unique value in the properties table in the GUID (AutomationML) field.
4. Click [OK].
5. Then start a new check run.