Supplier Primary Address default

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On contract Lines, the supplier record has a "Primary Address" field that is listed. On a single PROC BU to client BU relationship for a multi-address supplier, there is no field within the supplier profile where we selected this as a "primary address" but it is still being populated as such. 

Attachment below to showcase exact case scenario. Note: not to be confused with "primary pay" checkbox and it's related functionality.