How to set different relations to object Primary UID and to another UID?

I am a quite experienced in data modeling, but not too much in SQLDM. The problem is I can not find in SQL DM a feature that allows to set up two different relations between two objects with different set of parent-child attributes for the relations. E.g. object A has PK attribute A1 and attribute A2 as UID. When I am trying to create 1:M relation to another object B it always generates attribute A1 in the object B, although my intention is to create two different relations with different "parent" attributes A1 and A2. The relation property -> Attributes window does not allow to edit attributes. It's not a pure theoretical question. In the real word e.g. ISO_CURRENCY table has two unique identifiers for the currency - alpha and numeric and some data have FKs to first or second UID. Could someone give a clue how to handle that in SQL DM, please?

Thanks a lot David,
I read the thread you pointed carefully. IMHO the ODM problem in the light of this discussion is that the ODM Logical Model is not a Logical Model :) The classical ERD model which ODM is used for logical modeling is not supposed to reflect the way which the relation is implemented in the database model which can be not relational in general. But ODM creates "attribute of relation" in the child table demonstrating the relational database approach. So we have Logical Model as Relational Model with some kind of restrictions like I mentioned as the question for the thread.
IMHO It'd be more abstract from the database model if the ODM logical model relation implementation is not shown in the logical model and it can be altered on the relational model generation stage (default mode could be FK generation based on the object PK).

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