diff --git a/src/database/schemas/inventory/orderitem.schema.js b/src/database/schemas/inventory/orderitem.schema.js
index e50292f..b5d0e9b 100644
--- a/src/database/schemas/inventory/orderitem.schema.js
+++ b/src/database/schemas/inventory/orderitem.schema.js
@@ -62,7 +62,9 @@ orderItemSchema.statics.recalculate = async function (orderItem, user) {
     model: purchaseOrderModel,
     id: orderId,
     updateData: {
-      cost: { net: totalAmount, gross: totalAmountWithTax },
+      totalAmount: parseFloat(totalAmount),
+      totalAmountWithTax: parseFloat(totalAmountWithTax),
+      totalTaxAmount: parseFloat(totalAmountWithTax - totalAmount),
     },
     user,
   });
diff --git a/src/database/schemas/inventory/purchaseorder.schema.js b/src/database/schemas/inventory/purchaseorder.schema.js
index 4d08762..e4d8d5d 100644
--- a/src/database/schemas/inventory/purchaseorder.schema.js
+++ b/src/database/schemas/inventory/purchaseorder.schema.js
@@ -2,21 +2,12 @@ import mongoose from 'mongoose';
 import { generateId } from '../../utils.js';
 const { Schema } = mongoose;
 
-const itemSchema = new Schema({
-  itemType: { type: String, required: true },
-  item: { type: Schema.Types.ObjectId, refPath: 'items.itemType', required: true },
-  quantity: { type: Number, required: true },
-  itemCost: { type: Number, required: true },
-  totalCost: { type: Number, required: true },
-  totalCostWithTax: { type: Number, required: true },
-  taxRate: { type: Schema.Types.ObjectId, ref: 'taxRate', required: false },
-});
-
 const purchaseOrderSchema = new Schema(
   {
     _reference: { type: String, default: () => generateId()() },
-    cost: { net: { type: Number, required: true }, gross: { type: Number, required: true } },
-    items: [itemSchema],
+    totalAmount: { type: Number, required: true },
+    totalAmountWithTax: { type: Number, required: true },
+    totalTaxAmount: { type: Number, required: true },
     timestamp: { type: Date, default: Date.now },
     vendor: { type: Schema.Types.ObjectId, ref: 'vendor', required: true },
     state: {