Pass cvd benefit passed to us to another customer

Y imports -> sells to X -> sells to Z (all parties registered with excise)

Z wants an invoice something like as follows:

Value of materials: Rs 1000

CVD duties (addnl): Rs 100

Subtotal: Rs 1100

VAT                 55

Total payable: Rs 1155

Can X provide such and invoice or will the invoice have to have line of excise duty? Z is insistent about seeing CVD and not excise.