diff --git a/src/database/schemas/management/productsku.schema.js b/src/database/schemas/management/productsku.schema.js
index 1b5b807..9a8e24a 100644
--- a/src/database/schemas/management/productsku.schema.js
+++ b/src/database/schemas/management/productsku.schema.js
@@ -3,6 +3,7 @@ import { generateId } from '../../utils.js';
 const { Schema } = mongoose;
 
 const partSkuUsageSchema = new Schema({
+  part: { type: Schema.Types.ObjectId, ref: 'part', required: true },
   partSku: { type: Schema.Types.ObjectId, ref: 'partSku', required: true },
   quantity: { type: Number, required: true },
 });