Rfd-01a filing error for 100% export company

Hi Experts,

We seek your advice on a subject as below.

As we are a 100% export company to USA, we bill our customer thru a single invoice every month.

However, the payment for this invoice is received in multiple transactions on a on account basis.

While filing the RFD-01A form (Refund in case of non-payment of tax), the portal allows us to entre only one single FIRC against an invoice.

Please advise for our filing & your opinion in this regard.

Thanks,

Brijesh Singh