Limit choices for the 'Part' reference in the new model

InvenTree/part/migrations/0050_auto_20200917_2315.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.0.7 on 2020-09-17 23:15
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0049_partsellpricebreak'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='partsellpricebreak',
+            name='part',
+            field=models.ForeignKey(limit_choices_to={'salable': True}, on_delete=django.db.models.deletion.CASCADE, related_name='salepricebreaks', to='part.Part'),
+        ),
+    ]

InvenTree/part/models.py

@@ -1236,7 +1236,8 @@ class PartSellPriceBreak(common.models.PriceBreak):
 
     part = models.ForeignKey(
         Part, on_delete=models.CASCADE,
-        related_name='salepricebreaks'
+        related_name='salepricebreaks',
+        limit_choices_to={'salable': True}
     )
 
     class Meta: