Intra-Holding leasing considered cheating ?

I've set up a new subsidiary of my airline and transfered a few owned planes to the subsidiary. Now i want to lease back the planes from the subsidiary with the main holding. I get this error message:

  •  This transaction is considered cheating, and is therefore forbidden.

How can this be ? The enterprises are part of the same holding. There is an option of sale and lease-back but between holding and subsidiary but i didn't use that at the moment of transfer. If that is possible why wouldn't this be possible ? 

Did you use the asset management tool to lease back the a/c?

Ah...i didn't knew you could use the asset management after already transfered the plane. Nevermind. Got it now.