I did reflection and sent to subcontractor, when I receive back updated reflection project to import and update exiting to merge, updated schedule man-hours increasing two times more before merge.
So I did trick and solved this by copying without resource assignments, after that were imported and updated without problem, as I know it's not normal way
After merging man-hours increase approximately two times more and also resources duplicated for each activity
P6 version I'm using v.7.0
P6 version subcontractor using v.8.3