Calsoft-v3

Purchase Order screen shows all fields correctly, but Excel export is missing several important fields

Steps to Reproduce:

Go to Purchase → Add Purchase Order
Fill all fields (Supplier, Warehouse, Product, Tax, etc.)
Save Purchase Order
Click Export to Excel
Open downloaded Excel file

Current Behavior:
Excel file missing below fields:

Product Net Unit Cost
Quantity
Product Variant
Tax Rate Name
Discount
Expiry Date
Add Purchase Order Date
Reference No
Warehouse
Purchase Status
Supplier
Enter Product Name
Image

Expected Behavior:
Excel should include ALL fields shown in UI
Data in Excel should match Purchase Order screen
No field should be missing

Actual Issue:

UI shows all fields correctly
Excel export missing multiple important fields