diff --git a/accounting/converters.py b/accounting/converters.py
index 7b840ef..dbecbd6 100644
--- a/accounting/converters.py
+++ b/accounting/converters.py
@@ -206,4 +206,4 @@ class TransactionConverter:
         Returns:
             str: The transaction ID.
         """
-        return value.sn
+        return value.pk
diff --git a/accounting/templates/accounting/cash.html b/accounting/templates/accounting/cash.html
index f6d0b70..ddc1d95 100644
--- a/accounting/templates/accounting/cash.html
+++ b/accounting/templates/accounting/cash.html
@@ -127,7 +127,7 @@ First written: 2020/7/1
           <td class="amount">{{ item.debit_amount|accounting_amount }}</td>
           <td class="amount {% if item.balance < 0 %} text-danger {% endif %}">{{ item.balance|accounting_amount }}</td>
           <td class="actions">
-            {% if item.sn is not None %}
+            {% if item.pk is not None %}
               <a href="{% url_with_return "accounting:transactions.show" item.transaction.type item.transaction %}" class="btn btn-info" role="button">
                 <i class="fas fa-eye"></i>
                 <span class="d-none d-lg-inline">{% trans "View" context "Accounting|" as text %}{{ text|force_escape }}</span>
@@ -143,7 +143,7 @@ First written: 2020/7/1
   <ul class="list-group d-md-none">
     {% for item in item_list %}
       <li class="list-group-item {% if not item.is_balanced or item.has_order_hole %} list-group-item-danger {% endif %}">
-        {% if item.sn is not None %}
+        {% if item.pk is not None %}
           <a class="list-group-item-action" href="{% url_with_return "accounting:transactions.show" item.transaction.type item.transaction %}">
             <div class="date-account-line d-flex justify-content-between align-items-center">
               {{ item.transaction.date|smart_date }} {{ item.account.title|title }}
diff --git a/accounting/templates/accounting/journal.html b/accounting/templates/accounting/journal.html
index b782dd8..d5a166e 100644
--- a/accounting/templates/accounting/journal.html
+++ b/accounting/templates/accounting/journal.html
@@ -107,7 +107,7 @@ First written: 2020/7/17
           <td class="amount">{{ item.credit_amount|accounting_amount }}</td>
           <td>{{ item.transaction.note|default:"" }}</td>
           <td class="actions">
-            {% if item.sn is not None %}
+            {% if item.pk is not None %}
               <a href="{% url_with_return "accounting:transactions.show" item.transaction.type item.transaction %}" class="btn btn-info" role="button">
                 <i class="fas fa-eye"></i>
                 {% trans "View" context "Accounting|" as text %}{{ text|force_escape }}
@@ -123,7 +123,7 @@ First written: 2020/7/17
   <ul class="list-group d-lg-none">
     {% for item in item_list %}
       <li class="list-group-item {% if not item.is_balanced or item.has_order_hole %} list-group-item-danger {% endif %}">
-        {% if item.sn is not None %}
+        {% if item.pk is not None %}
           <a class="list-group-item-action" href="{% url_with_return "accounting:transactions.show" item.transaction.type item.transaction %}">
             <div class="{% if item.is_credit %} journal-credit {% else %} journal-debit {% endif %}">
               <div class="date-account-line">
diff --git a/accounting/templates/accounting/ledger.html b/accounting/templates/accounting/ledger.html
index 969d044..8b35a3c 100644
--- a/accounting/templates/accounting/ledger.html
+++ b/accounting/templates/accounting/ledger.html
@@ -130,7 +130,7 @@ First written: 2020/7/16
           <td class="amount">{{ item.credit_amount|accounting_amount }}</td>
           <td class="amount {% if item.balance < 0 %} text-danger {% endif %}">{{ item.balance|accounting_amount }}</td>
           <td class="actions">
-            {% if item.sn is not None %}
+            {% if item.pk is not None %}
               <a href="{% url_with_return "accounting:transactions.show" item.transaction.type item.transaction %}" class="btn btn-info" role="button">
                 <i class="fas fa-eye"></i>
                 <span class="d-none d-lg-inline">{% trans "View" context "Accounting|" as text %}{{ text|force_escape }}</span>
@@ -146,7 +146,7 @@ First written: 2020/7/16
   <ul class="list-group d-md-none">
     {% for item in item_list %}
       <li class="list-group-item {% if not item.is_balanced or item.has_order_hole or not item.is_credit_card_paid %} list-group-item-danger {% endif %}{% if item.is_existing_equipment %} list-group-item-info {% endif %}">
-        {% if item.sn is not None %}
+        {% if item.pk is not None %}
           <a class="list-group-item-action" href="{% url_with_return "accounting:transactions.show" item.transaction.type item.transaction %}">
             <div class="date-account-line">
               {{ item.transaction.date|smart_date }} {{ item.account.title|title }}
diff --git a/accounting/utils.py b/accounting/utils.py
index e840c83..39dad61 100644
--- a/accounting/utils.py
+++ b/accounting/utils.py
@@ -260,14 +260,14 @@ def find_imbalanced(records):
     Args:
         records (list[Record]): The accounting records.
     """
-    imbalanced = [x.sn for x in Transaction.objects
+    imbalanced = [x.pk for x in Transaction.objects
                   .annotate(
                     balance=Sum(Case(
                         When(record__is_credit=True, then=-1),
                         default=1) * F("record__amount")))
                   .filter(~Q(balance=0))]
     for record in records:
-        record.is_balanced = record.transaction.sn not in imbalanced
+        record.is_balanced = record.transaction.pk not in imbalanced
 
 
 def find_order_holes(records):