Is ok to have 2 primary keys for Recipients?

[god_prophet]

I'm adding some fields to the abc:recipients (recipient's extension) schema. 

It currently has 01 PK in the base recipient schema. I need to add an attribute from the extension also as PK.  So both are not a combined PK, rather individual PKs.

Is this ok? 

This is how I have set the codinterno field as PK:

<key internal="true" name="codinterno_pk">
<keyfield xpath="@codinterno"/>
</key>