diff --git a/InvenTree/build/models.py b/InvenTree/build/models.py
index 770b78a7f6..f05fbe74cf 100644
--- a/InvenTree/build/models.py
+++ b/InvenTree/build/models.py
@@ -1018,6 +1018,20 @@ class Build(MPTTModel, ReferenceIndexingMixin):
         """Returns True if the un-tracked parts are fully allocated for this BuildOrder."""
         return self.is_fully_allocated(None)
 
+    def has_overallocated_parts(self, output):
+        """Check if parts have been 'over-allocated' against the specified output.
+
+        Note: If output=None, test un-tracked parts
+        """
+
+        bom_items = self.tracked_bom_items if output else self.untracked_bom_items
+
+        for bom_item in bom_items:
+            if self.allocated_quantity(bom_item, output) > self.required_quantity(bom_item, output):
+                return True
+
+        return False
+
     def unallocated_bom_items(self, output):
         """Return a list of bom items which have *not* been fully allocated against a particular output."""
         unallocated = []
diff --git a/InvenTree/build/serializers.py b/InvenTree/build/serializers.py
index daf142cf5d..7278c3f3af 100644
--- a/InvenTree/build/serializers.py
+++ b/InvenTree/build/serializers.py
@@ -466,6 +466,22 @@ class BuildCancelSerializer(serializers.Serializer):
 class BuildCompleteSerializer(serializers.Serializer):
     """DRF serializer for marking a BuildOrder as complete."""
 
+    accept_overallocated = serializers.BooleanField(
+        label=_('Accept Overallocated'),
+        help_text=_('Accept stock items which have been overallocated to this build order'),
+        required=False,
+        default=False,
+    )
+
+    def validate_accept_overallocated(self, value):
+        """Check if the 'accept_overallocated' field is required"""
+        build = self.context['build']
+
+        if build.has_overallocated_parts(output=None) and not value:
+            raise ValidationError(_('Some stock items have been overallocated'))
+
+        return value
+
     accept_unallocated = serializers.BooleanField(
         label=_('Accept Unallocated'),
         help_text=_('Accept that stock items have not been fully allocated to this build order'),
diff --git a/InvenTree/templates/js/translated/build.js b/InvenTree/templates/js/translated/build.js
index b1315f1d35..fb1ca9c3ef 100644
--- a/InvenTree/templates/js/translated/build.js
+++ b/InvenTree/templates/js/translated/build.js
@@ -174,6 +174,7 @@ function completeBuildOrder(build_id, options={}) {
 
     var fields = {
         accept_unallocated: {},
+        accept_overallocated: {},
         accept_incomplete: {},
     };