Have a problem with Imdeditor, hope someone can help please

[Mr.Gee]

I add 3 GKGun to a BigShip with refpoints.

Each refpoint works fine, but i can not equip 3 Guns at the same time.
"This device cannot installed into this socket"

I can switch the cannon from right to left to the front, but only 1.
If i equip no one, i can install on in each slot. At the 2. cannon i get
the error message.

.ini is ref to 3 unic slots, carsasses.xml is fix

Someone an idea what is missing or could be wrong?