Renamed the "eid" field to "id" in the LineItemForm form, since the problem is found. It was the "id" property of the enclosing FormField. If we extract the form from FormField, we can still access the "id" field.

src/accounting/templates/accounting/journal-entry/include/form-line-item.html

@@ -21,8 +21,8 @@ First written: 2023/2/25
 #}
 {# <ul> For SonarQube not to complain about incorrect HTML #}
 <li id="accounting-currency-{{ currency_index }}-{{ debit_credit }}-{{ line_item_index }}" class="list-group-item list-group-item-action d-flex justify-content-between accounting-currency-{{ currency_index }}-{{ debit_credit }} {% if form.offsets %} accounting-matched-line-item {% endif %}" data-currency-index="{{ currency_index }}" data-debit-credit="{{ debit_credit }}" data-line-item-index="{{ line_item_index }}" {% if form.is_need_offset %} data-is-need-offset="true" {% endif %}>
-  {% if form.eid.data %}
-    <input type="hidden" name="currency-{{ currency_index }}-{{ debit_credit }}-{{ line_item_index }}-eid" value="{{ form.eid.data }}">
+  {% if form.id.data %}
+    <input type="hidden" name="currency-{{ currency_index }}-{{ debit_credit }}-{{ line_item_index }}-id" value="{{ form.id.data }}">
   {% endif %}
   <input id="accounting-currency-{{ currency_index }}-{{ debit_credit }}-{{ line_item_index }}-no" type="hidden" name="currency-{{ currency_index }}-{{ debit_credit }}-{{ line_item_index }}-no" value="{{ line_item_index }}">
   <input id="accounting-currency-{{ currency_index }}-{{ debit_credit }}-{{ line_item_index }}-original-line-item-id" class="accounting-original-line-item-id" type="hidden" name="currency-{{ currency_index }}-{{ debit_credit }}-{{ line_item_index }}-original_line_item_id" value="{{ form.original_line_item_id.data|accounting_default }}" data-date="{{ form.original_line_item_date|accounting_default }}" data-text="{{ form.original_line_item_text|accounting_default }}">