How to not enter a supplier on a lease

Summary:

Is it possible to create a lease with no supplier?

Content (required):

Setting up lease accounting to record one lease in a foreign BU. Payables integration is off, as payments for this lease are handled via a separate process. This is just to record accounting for ASC842.

This BU does not have purchasing or suppliers at all. However, when entering a payment schedule, the supplier fields are required, and since there are no suppliers attached to this BU, we cannot create a payment schedule. Is there any way to continue other than creating some sort of shell supplier?

Version (include the version you are using, if applicable):