Atomic Systems

Hello everybody
I recently "bumped" into a curious but annoying phenomenon : some of my rolling stock can be used without problem to make a train with the activity editor but, if uncoupled during the game or used as a static rake intended to be picked up by an engine, CANNOT be re-coupled or coupled to the engine or with each other. Of course, there is full compatibility between the various items of rolling stock as concerns the .wag file (coupling, buffers, brakes). This worry concerns more specifically the luxury stainless steel french passenger coaches ex-Trans Europ Express.
Would someone have encountered the same problem... and solved it ?

Thank you in advance !

Send me the wag and sd files and I will have a look..
Didn't say I would solve it..