If you want to see the received advance in proforma, Follow below steps.

[A] After you generate OC, Create Receipt for Advance received. As shown below.

[B] Once you have created a receipt voucher for advance payment, Now generate Proforma using the "Create Document" button.

[C] You can see the below image, Advance Payment is included in proforma.

Keywords: ARV Receipt, Advance Payment in Proforma.