Hi @emilyh
Unfortunately, as you’ve discovered, a journal can’t be allocated to a project, but there are two ways around this.
The first is to allow the nominal codes for balance sheet items to be used in purchase invoices. This is achievable. You can found out more in this post on how to enable this.
The second option is to use adjustments on projects themselves. You can add an adjustment to the invoice or cash balance as your wish. There’s more information on this here
I hope that helps