Fix currency choices for PartPricing model (#12336)

* Fix currency choices for PartPricing model

- Remove dynamic choices from model definition
- Move validation step to the serializer
- Add validator to ensure only valid currencies can be used

* Add regression test

* Bump API version

src/backend/InvenTree/InvenTree/api_version.py

@@ -1,11 +1,14 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 516
+INVENTREE_API_VERSION = 517
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
 
+v517 -> 2026-07-08 : https://github.com/inventree/InvenTree/pull/12336
+    - Fix currency code options for the PartPricing  model and API endpoints
+
 v516 -> 2026-07-03 : https://github.com/inventree/InvenTree/pull/12295
     - Adds "consumable" field to the Part model and API endpoints
 

src/backend/InvenTree/InvenTree/test_commands.py

@@ -1,5 +1,7 @@
 """Tests for custom InvenTree management commands."""
 
+import os
+import subprocess
 from pathlib import Path
 
 from django.conf import settings
@@ -15,6 +17,48 @@ from InvenTree.config import get_testfolder_dir
 class CommandTestCase(TestCase):
     """Test case for custom management commands."""
 
+    def test_makemigrations_currency_overrides_no_changes(self):
+        """Ensure currency list changes do not cause migration drift."""
+        currency_sets = ['USD,EUR,GBP', 'JPY,CNY,KRW']
+
+        for currency_codes in currency_sets:
+            with self.subTest(currency_codes=currency_codes):
+                old_value = os.environ.get('INVENTREE_CURRENCY_CODES')
+
+                try:
+                    os.environ['INVENTREE_CURRENCY_CODES'] = currency_codes
+                    project_dir = Path(__file__).resolve().parents[1]
+
+                    result = subprocess.run(
+                        [
+                            'python3',
+                            'manage.py',
+                            'makemigrations',
+                            '--check',
+                            '--dry-run',
+                            '--verbosity',
+                            '0',
+                        ],
+                        cwd=project_dir,
+                        env=os.environ.copy(),
+                        capture_output=True,
+                        text=True,
+                        check=False,
+                    )
+
+                    if result.returncode != 0:
+                        self.fail(
+                            'makemigrations reported schema changes '
+                            f'for INVENTREE_CURRENCY_CODES={currency_codes}\n'
+                            f'stdout:\n{result.stdout}\n'
+                            f'stderr:\n{result.stderr}'
+                        )
+                finally:
+                    if old_value is None:
+                        os.environ.pop('INVENTREE_CURRENCY_CODES', None)
+                    else:
+                        os.environ['INVENTREE_CURRENCY_CODES'] = old_value
+
     def test_schema(self):
         """Test the schema generation command."""
         output = call_command('schema', file='schema.yml', verbosity=0)

src/backend/InvenTree/part/migrations/0152_alter_partpricing_currency.py

@@ -0,0 +1,26 @@
+# Generated by Django 5.2.15 on 2026-07-08 00:00
+
+import InvenTree.validators
+import common.currency
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("part", "0151_part_consumable"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="partpricing",
+            name="currency",
+            field=models.CharField(
+                default=common.currency.currency_code_default,
+                help_text="Currency used to cache pricing calculations",
+                max_length=10,
+                validators=[InvenTree.validators.validate_currency_code],
+                verbose_name="Currency",
+            ),
+        ),
+    ]

src/backend/InvenTree/part/models.py

@@ -3378,7 +3378,7 @@ class PartPricing(common.models.MetaMixin):
         max_length=10,
         verbose_name=_('Currency'),
         help_text=_('Currency used to cache pricing calculations'),
-        choices=common.currency.currency_code_mappings(),
+        validators=[validators.validate_currency_code],
     )
 
     scheduled_for_update = models.BooleanField(default=False)

src/backend/InvenTree/part/serializers.py

@@ -1429,7 +1429,9 @@ class PartPricingSerializer(InvenTree.serializers.InvenTreeModelSerializer):
             'update',
         ]
 
-    currency = serializers.CharField(allow_null=True, read_only=True)
+    currency = InvenTree.serializers.InvenTreeCurrencySerializer(
+        allow_null=True, read_only=True
+    )
 
     updated = serializers.DateTimeField(allow_null=True, read_only=True)