Invalid order/document reference. Order header XX does not belong to supplier XX

The Coupa PO number is valid, but it does not belong to the correct supplier.

How do I fix it?

To resolve this error, look up the Coupa PO and check the supplier's cXML invoicing setup.

The <From> and <Sender> domain and identity must match the file, and must match the setup in Coupa.

Example

<Header>
		<From>
				<Credential domain="xxx">
						<Identity> xxx </Identity>
				</Credential>
		</From>
		<To>
				<Credential domain="xxx">
						<Identity> xxx </Identity>
				</Credential>
		</To>
		<Sender>
				<Credential domain="xxx">
						<Identity> xxx </Identity>
						<SharedSecret> xxx </SharedSecret>
				</Credential>
				<UserAgent>Coupa Procurement 1.0</UserAgent>
		</Sender>
</Header>