Arbortext 6.1 custom application issue when upgraded to ATX 7.0

We are using arbortext 6.1, we are using custom application containing different schemas and it is referenced from a server....application works fine in arbortext 6.1 but the same same application is not working properly in arbortext 7.0 getting unknown tags and attribute errors saying its not defined in xsd file, which is really strange.

structure of the application is each schema folder is different under doctypes for ex - doctypes->diagonostic, doctypes->description etc so each schema has its own xsd files, schema template and catalog file, dcf file etc.

need help on this asap!

please let me know the root cause of this issue

Awaiting your reply