OK, so we had this problem importing XML files into P6 and it stumped us for a while. It turns out it was a bug in P6 Professional version 18.8 and there is a patch to fix it http://ed.gr/blcwh
I hope this helps other folks that have been struggling with this.
Colin
thanks
Following on from this regarding issues importing Microsoft Project XML files in to Primavera P6 version 18, you may be still having problems even after the patch 18.8.8. Oracle has now released a 2nd fix (18.8.9) for this bug that was introducedin the last fix http://ed.gr/bmgub
I hope this helps.
Colin