Will the e-invoice details be pushed to the GST System? Will they populate the return?

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Will the e-invoice details be pushed to the GST System? Will they populate the return?

Yes. On successful reporting of invoice details to IRP, the invoice data (payload), including IRN, will be saved in GST System. The GST system will auto-populate them into GSTR-1 of the supplier and GSTR-2A of respective receivers.
The source marked as ‘e-invoice’ will also show IRN and IRN date in GSTR-1 and GSTR-2A.