Hi @FULGENCE KOFFI !
I don't understand.
Have you added a new field called attribute in classifications? CLASSSTRUCTURE.ATTRIBUTE?
Or do you mean the attributes of the classifications?
If it is the first, when you go to SR.CLASSSTRUCTURE in "Database Configuration" and add your cross domain, it will copy CLASSSTRUCTURE.ATTRIBUTE -> SR.ATTRIBUTE.
If it is the latter, it is not used that way because the attributes of the classifications are saved in another table (CLASSSPEC) and it work so that when you assign that classification to an SR, it will transfer the attribute structure to each SR that you assign that classification to (and then complete with data)
If you give me a clear example of what you need to do, I will try to replicate it and send you step by step.
Regards!