Fix: make backend monetary validation accept unpadded decimals (#6626)

src/documents/serialisers.py

@@ -547,7 +547,7 @@ class CustomFieldInstanceSerializer(serializers.ModelSerializer):
                 except Exception:
                     # If that fails, try to validate as a monetary string
                     RegexValidator(
-                        regex=r"^[A-Z]{3}-?\d+(\.\d{2,2})$",
+                        regex=r"^[A-Z]{3}-?\d+(\.\d{1,2})$",
                         message="Must be a two-decimal number with optional currency code e.g. GBP123.45",
                     )(data["value"])
             elif field.data_type == CustomField.FieldDataType.STRING:

src/documents/tests/test_api_custom_fields.py

@@ -499,22 +499,6 @@ class TestCustomFieldsAPI(DirectoriesMixin, APITestCase):
 
         self.assertEqual(resp.status_code, status.HTTP_400_BAD_REQUEST)
 
-        resp = self.client.patch(
-            f"/api/documents/{doc.id}/",
-            data={
-                "custom_fields": [
-                    {
-                        "field": custom_field_money.id,
-                        # Too few places past decimal
-                        "value": "GBP12.1",
-                    },
-                ],
-            },
-            format="json",
-        )
-
-        self.assertEqual(resp.status_code, status.HTTP_400_BAD_REQUEST)
-
         resp = self.client.patch(
             f"/api/documents/{doc.id}/",
             data={