Instead of credit noting you can do a contra posting to incur the anticipated disbursement and then do a credit posting which can be billed.
Follow the below to incur the Anticipated:
In Postings select Disbursement Payment (Payments tab) or Disbursement Journal (Journal tab).
Put in the matter and select the Anticipated box.
Select the anticipated disbursement that was on the bill.
This will populated information required, add any details you want to include on the posting.
Select OK/Next.
Follow the below to create a receipt posting that can then be billed as a credit note:
In Postings select Disbursement Receipt (Receipts tab)/Disbursement journal from Nominal to Disbursement (Journal tab).
Put in the matter or nominal.
Fill in all the relevant information required.
Select OK/Next.
Follow the below to create the negative disbursement bill:
In Postings select Bills tab.
Put the matter in and all the details required for the posting.
Select Specify on the disbursements bills box and Go this will give you a list of the disbursements.
Select the Disbursement credit and tick it to include in the bill.
Go down to OK/Next and produce the bill.
Put in the bill description and who authorised on the next screen and select Produce.