iby_disbursement_setup_pub.set_payee_instr_assignment returns INVALID_PARTY_CONTEXT

We are on EBS 12.2.5 and I am trying to using IBY_EXT_BANKACCT_PUB.CREATE_EXT_BANK_ACCT to create a supplier bank account and then iby_disbursement_setup_pub.set_payee_instr_assignment to do the assignment. When I assign it, I am receiving the error message:

X_RESPONSE.Result_Code = INVALID_PARTY_CONTEXT

I see a couple of notes on this saying that the supplier site type should be 'OFFICE' or 'HOME' when the supplier type is 'EMPLOYEE'. My supplier type is a custom lookup code. What column are the notes referring to when they say the supplier site should be 'HOME' or 'OFFICE'. I have not been able to find a supplier site type.