Transfer order from APO to ECC

Hi all

I have the following scenario. FInish goods and semifinish are planned in apo.

When I create a planned order in APO the semifinish good is ok in the components. But when I save and transfer to ECC, it is creating the planned order duplicating the semifinish good. It is adding a position 9999 at the end of the components with the semifinish good. And then it is transfer back to APO with the semifinish good duplicated.

The semi has X0.