Added MinMoneyValidator to InvenTreeModelMoneyField

- Refactor edit and delete forms for PurchaseOrderLineItem

InvenTree/order/serializers.py

@@ -5,13 +5,16 @@ JSON serializers for the Order API
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from rest_framework import serializers
-
-from sql_util.utils import SubqueryCount
+from django.utils.translation import ugettext_lazy as _
 
 from django.db.models import Case, When, Value
 from django.db.models import BooleanField
 
+from rest_framework import serializers
+from sql_util.utils import SubqueryCount
+
+import djmoney.settings
+
 from InvenTree.serializers import InvenTreeModelSerializer
 from InvenTree.serializers import InvenTreeAttachmentSerializerField
 
@@ -125,6 +128,11 @@ class POLineItemSerializer(InvenTreeModelSerializer):
 
     destination = LocationBriefSerializer(source='get_destination', read_only=True)
 
+    purchase_price_currency = serializers.ChoiceField(
+        choices=djmoney.settings.CURRENCY_CHOICES,
+        help_text=_('Purchase price currency'),
+    )
+
     class Meta:
         model = PurchaseOrderLineItem