E1 9.2 How to transfer a child LPN to a parent LPN ? (P46L31)

Hi JDE folk, I tried to transfer a child LPN to its original parent LPN thanks to the dedicated P46L31. But I obtain an "Location Invalid " error code. The child LPN is not placed on the same location than the parent LPN one.

When I transferred the child LPN to the same location, it works.

Wouldn't it be possible to transfer directly the child LPN to the parent LPN ?

I hope so because it's very time wasting and confusing.

Thks. Mathieu