Is it possible to create User defined relationship across multiple database in an Appl Data Model.

Using OEM 13c data masking pack.
Can relationship be defined across multiple databases when creating application data model?
E.g. scenario -
Database_A (source), table_a, column_a is related to Database_B, table_b, column_b.

Desired outcome:
When database_a_table_a.column_a is masked, the same masking should also get applied to
database_b.table_b.column_b automatically.

What I tried -
I can add user-defined relationship between columns within same application and same schema;
however, it does not works when trying to use multiple database or schema.

What is being done -
Multiple application defined in ADM that maps to different databases.