P6 Export to XML UID mismatch

When we export a project from P6 EPPM in .xml format compatible with MS Project 2016, the links of some activities are lost even before import into MS Project.

 

The following explanation shows an example of what happens (images attached):

 

           1. In P6, activity "CTN-1330" is predecessor to activity CTN-1430

           2. When exporting to .xml compatible with MS Project 2016, the same activity

(CTN-1330) is preceded by the activity with UID "16".

           3. Looking for the activity with UID "16" in the .xml, we find no activity.

           4. Looking for the activity "CTN-1430" in the .xml, we see that its UID is "12"

The link between activities "CTN-1330" and "CTN-1430" is lost even before import into MS Project...