Orphan segments missing

Dear Community,

I need to align a target text with an existing translation list (json files) where the target contains more segments than the source. From the Help documentation I gathered that this what the alignment option "Assign orphan segments" is designed for. However, it will not work. All I get is a notification saying that 10 segments were not found in the translation list without offering a way of including them.

Can anybody help?

Thanx.

carmen