Revised so that when the account selector finds the codes from the form, the journal entry editor is used to find the form instead of messing-up with the TransactionForm class and its static method that was a shortcut to the private instance method of the same name.

src/accounting/static/js/account-selector.js

@@ -150,7 +150,7 @@ class AccountSelector {
      * @return {string[]} the account codes that are used in the form
      */
     #getCodesUsedInForm() {
-        const inUse = TransactionForm.getAccountCodesUsed(this.#entryType);
+        const inUse = this.#entryEditor.getTransactionForm().getAccountCodesUsed(this.#entryType);
         if (this.#entryEditor.getAccountCode() !== null) {
             inUse.push(this.#entryEditor.getAccountCode());
         }

src/accounting/static/js/journal-entry-editor.js

@@ -150,6 +150,15 @@ class JournalEntryEditor {
         };
     }
 
+    /**
+     * Returns the transaction form.
+     *
+     * @return {TransactionForm} the transaction form
+     */
+    getTransactionForm() {
+        return this.#side.currency.form;
+    }
+
     /**
      * Saves the summary from the summary editor.
      *

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

@@ -184,7 +184,7 @@ class TransactionForm {
      * @param entryType {string} the entry type, either "debit" or "credit"
      * @return {string[]} the account codes used in the form
      */
-    #getAccountCodesUsed(entryType) {
+    getAccountCodesUsed(entryType) {
         let inUse = [];
         for (const currency of this.#currencies) {
             inUse = inUse.concat(currency.getAccountCodesUsed(entryType));
@@ -280,16 +280,6 @@ class TransactionForm {
     static initialize() {
         this.#form = new TransactionForm()
     }
-
-    /**
-     * Returns the account codes used in the form.
-     *
-     * @param entryType {string} the entry type, either "debit" or "credit"
-     * @return {string[]} the account codes used in the form
-     */
-    static getAccountCodesUsed(entryType) {
-        return this.#form.#getAccountCodesUsed(entryType);
-    }
 }
 
 /**