diff --git a/src/backend/InvenTree/order/api.py b/src/backend/InvenTree/order/api.py
index 7ad506bc9e..9c608e32a5 100644
--- a/src/backend/InvenTree/order/api.py
+++ b/src/backend/InvenTree/order/api.py
@@ -84,6 +84,8 @@ class GeneralExtraLineList(SerializerContextMixin, DataExportViewMixin):
 
     ordering_fields = ['quantity', 'notes', 'reference', 'line']
 
+    ordering_field_aliases = {'line': ['line_int', 'line']}
+
     search_fields = ['quantity', 'notes', 'reference', 'description']
 
     filterset_fields = ['order']
@@ -717,7 +719,7 @@ class PurchaseOrderLineItemList(
         'order': 'order__reference',
         'status': 'order__status',
         'complete_date': 'order__complete_date',
-        'line': ['line', 'part__SKU'],
+        'line': ['line_int', 'line', 'part__SKU'],
     }
 
     ordering_fields = [
@@ -1077,7 +1079,7 @@ class SalesOrderLineItemList(
         'part': 'part__name',
         'IPN': 'part__IPN',
         'order': 'order__reference',
-        'line': ['line', 'part__name'],
+        'line': ['line_int', 'line', 'part__name'],
     }
 
     search_fields = ['part__name', 'quantity', 'reference']
@@ -1728,7 +1730,7 @@ class ReturnOrderLineItemList(
     ]
 
     ordering_field_aliases = {
-        'line': ['line', 'item__part__name'],
+        'line': ['line_int', 'line', 'item__part__name'],
         'part': 'item__part__name',
         'IPN': 'item__part__IPN',
         'stock': ['item__quantity', 'item__serial_int', 'item__serial'],
diff --git a/src/backend/InvenTree/order/migrations/0117_purchaseorderextraline_line_int_and_more.py b/src/backend/InvenTree/order/migrations/0117_purchaseorderextraline_line_int_and_more.py
new file mode 100644
index 0000000000..ae7271d82a
--- /dev/null
+++ b/src/backend/InvenTree/order/migrations/0117_purchaseorderextraline_line_int_and_more.py
@@ -0,0 +1,76 @@
+# Generated by Django 5.2.13 on 2026-05-07 04:10
+
+from django.db import migrations, models
+
+
+def add_integer_line_number(apps, schema_editor):
+    """Add integer line numbers to existing line items."""
+
+    print("\nUpdating line items to add integer line numbers:")
+
+    for model in [
+        apps.get_model('order', 'PurchaseOrderLineItem'),
+        apps.get_model('order', 'ReturnOrderLineItem'),
+        apps.get_model('order', 'SalesOrderLineItem'),
+        apps.get_model('order', 'PurchaseOrderExtraLine'),
+        apps.get_model('order', 'ReturnOrderExtraLine'),
+        apps.get_model('order', 'SalesOrderExtraLine'),
+    ]:
+        items = []
+
+        for item in model.objects.exclude(line__isnull=True).exclude(line=''):
+            # Attempt to convert the existing line number to an integer
+            try:
+                item.line_int = int(item.line)
+                items.append(item)
+            except (ValueError, TypeError):
+                pass
+
+        if len(items) > 0:
+            print(f"- Updating {len(items)} items for model {model._meta.model_name}")
+            model.objects.bulk_update(items, ['line_int'], batch_size=250)
+
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("order", "0116_purchaseorderextraline_line_and_more"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="purchaseorderextraline",
+            name="line_int",
+            field=models.IntegerField(default=0),
+        ),
+        migrations.AddField(
+            model_name="purchaseorderlineitem",
+            name="line_int",
+            field=models.IntegerField(default=0),
+        ),
+        migrations.AddField(
+            model_name="returnorderextraline",
+            name="line_int",
+            field=models.IntegerField(default=0),
+        ),
+        migrations.AddField(
+            model_name="returnorderlineitem",
+            name="line_int",
+            field=models.IntegerField(default=0),
+        ),
+        migrations.AddField(
+            model_name="salesorderextraline",
+            name="line_int",
+            field=models.IntegerField(default=0),
+        ),
+        migrations.AddField(
+            model_name="salesorderlineitem",
+            name="line_int",
+            field=models.IntegerField(default=0),
+        ),
+        migrations.RunPython(
+            code=add_integer_line_number,
+            reverse_code=migrations.RunPython.noop,
+        ),
+    ]
diff --git a/src/backend/InvenTree/order/models.py b/src/backend/InvenTree/order/models.py
index 2e36b6228c..589291b2e7 100644
--- a/src/backend/InvenTree/order/models.py
+++ b/src/backend/InvenTree/order/models.py
@@ -1755,6 +1755,8 @@ class OrderLineItem(InvenTree.models.InvenTreeMetadataModel):
 
     Attributes:
         quantity: Number of items
+        line: The line number for this item (optional)
+        line_int: An integer line number for this item (optional - used for natural sorting)
         reference: Reference text (e.g. customer reference) for this line item
         project_code: Project code associated with this line item (optional)
         note: Annotation for the item
@@ -1778,6 +1780,15 @@ class OrderLineItem(InvenTree.models.InvenTreeMetadataModel):
 
         update_order = kwargs.pop('update_order', True)
 
+        # Update the integer representation of the line number (for natural sorting)
+        if self.line:
+            try:
+                self.line_int = int(self.line)
+            except (TypeError, ValueError):
+                self.line_int = 0
+        else:
+            self.line_int = 0
+
         super().save(*args, **kwargs)
         if update_order and self.order:
             self.order.save()
@@ -1819,6 +1830,8 @@ class OrderLineItem(InvenTree.models.InvenTreeMetadataModel):
         help_text=_('Line number for this item (optional)'),
     )
 
+    line_int = models.IntegerField(default=0, blank=False, null=False)
+
     reference = models.CharField(
         max_length=100,
         blank=True,