you can kind of set up more than one account in an invoice.

src/clj/auto_ap/graphql.clj

@@ -406,6 +406,7 @@
     :add_invoice
     {:fields {:id {:type :id}
               :invoice_number {:type 'String}
+              :expense_accounts {:type '(list :edit_expense_account)}
               :location {:type 'String}
               :date {:type 'String}
               :client_id {:type :id}