diff --git a/apps/inm/serializers.py b/apps/inm/serializers.py
index 6770119c..19c92e8b 100644
--- a/apps/inm/serializers.py
+++ b/apps/inm/serializers.py
@@ -129,7 +129,7 @@ class MIOItemCreateSerializer(CustomModelSerializer):
                   'batch', 'count', 'assemb', 'is_testok', 'mioitemw', 'mb', 'wm', 'unit_price', 'note', "pack_index"]
         extra_kwargs = {
             'mio': {'required': True}, 'warehouse': {'required': False},
-            'material': {'required': False}, 'batch': {'required': False}}
+            'material': {'required': False}, 'batch': {'required': False, "allow_null": True, "allow_blank": True}}
 
 
     def create(self, validated_data):