Please follow the steps below to deal with the above query, if this is not a suitable workaround, then please raise a new case online and reference the title of this article, and we can together find an alternative soultion.
On the matter where you have a DUB. Go To Client Postings – Pay Unpaid Disbursements and pay the anticipated DIsb.
Then via Nominal Ledger – Bank Receipt - A dummy receipt would then be posted to a Nominal to contra the bank entry for the matter payment.
You would then post a Supplier Invoice via Purchase Ledger – Firm Invoice assigning this to your Nominal.
This Firm Supplier invoice can then be picked up in your Supplier payments along with other invoices for the same supplier, and you would reconcile this at the bank.