Supplier Address Used for Purchasing Contracts

Summary

If a supplier has mutliple addresses, how does the system determine the address for the supplier identified as the External Customer Party Address?

Content

I am working in Enterprise Contracts and the Contract Header is selecting the "<?ExternalCustomerPartyPVORow/Address1?>  as the default on the contract.  I cannot determine how the contract is selecting the specific address based on the supplier profile set up.  Is this something that can be changed?  In this particular situation, the supplier has multiple addresses set up (all are valid) and the one that is being selected is not the correct address for the contract.