It's ok I found it, it's because the original record is 'locked'. What I've done is made sure if it's a pc ship then it overrides the locked status. That'll be in the v1.2.1 update, working on that for the next week or so.
You can edit your XML if you need to now, find the locked node 'root -> charspacecraftsheet -> id of the ship -> locked' and change the value to '0' or '-1'.
Cheers
MBM