If you are modifying a voucher and an e-invoice has already been generated for that voucher, BUSY will prompt you to inform
you that you have already generated an e-invoice for this voucher,you cant modify it,because As per Government portal
guidelines,You cannot modify invoices for which e-invoices have already been generated. To make modifications, you must
first cancel the voucher and e invoice in your BUSY software.
To cancel e invoice from BUSY you can follow given steps:
Step 1:open that voucher in modify mode,
Step 2:Here is option in the title bar Cancel,click on cancel.
Step 3:Then ok to cancel, After that cancel e invoice on portal,specify Y,give reason why are you cancel this,then click
ok,the e invoice will be canceled on portal.
Step 4:After that,you can generate a new e-invoice with the changes using a different invoice number.