Moved the ACCOUNT_REQUIRED validator from the "accounting.journal_entry.forms.line_item" module to the "accounting.forms" module, in order to share it.

src/accounting/forms.py

@@ -22,12 +22,18 @@ import re
 from flask_babel import LazyString
 from flask_wtf import FlaskForm
 from wtforms import StringField, ValidationError
+from wtforms.validators import DataRequired
 
 from accounting import db
 from accounting.locale import lazy_gettext
 from accounting.models import Currency, Account
 
 
+ACCOUNT_REQUIRED: DataRequired = DataRequired(
+    lazy_gettext("Please select the account."))
+"""The validator to check if the account code is empty."""
+
+
 class CurrencyExists:
     """The validator to check if the account exists."""