Fixed the addJournalEntry method of the DebitCreditSideSubForm sub-form to re-validate the whole side after a new journal entry is added.

src/accounting/static/js/transaction-form.js

@@ -502,6 +502,7 @@ class DebitCreditSideSubForm {
         this.#entries.push(entry);
         this.#resetDeleteJournalEntryButtons();
         this.#initializeDragAndDropReordering();
+        this.validate();
         return entry;
     }