Add validation to part units field

InvenTree/part/migrations/0110_alter_part_units.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.19 on 2023-05-19 03:31
+
+import InvenTree.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0109_auto_20230517_1048'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='part',
+            name='units',
+            field=models.CharField(blank=True, default='', help_text='Units of measure for this part', max_length=20, null=True, validators=[InvenTree.validators.validate_physical_units], verbose_name='Units'),
+        ),
+    ]

InvenTree/part/models.py

@@ -984,6 +984,9 @@ class Part(InvenTreeBarcodeMixin, InvenTreeNotesMixin, MetadataMixin, MPTTModel)
         blank=True, null=True,
         verbose_name=_('Units'),
         help_text=_('Units of measure for this part'),
+        validators=[
+            validators.validate_physical_units,
+        ]
     )
 
     assembly = models.BooleanField(