Inexplicable "Obsolete Data format" message when opening scene

[rode3d]

Hi!

I'm having a strange issue.

I assign scripted custom attributes to an object. Then I save the scene.

When I re-open the scene I get the message "Obsolete Data Format".

How is this posible?

Have tried it in Max 2015 and 2017 and happens the same.

Please help! 

[denisT.MaxDoctor]

Obviously, the problem is the CA's code and how the CA was assigned... Without the knowing these things it's hard to answer your question and solve the issue