how to create invoice for closed SO

Summary:

how to create invoice for closed SO

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Dropship SO status is Awaiting Billing. After completion of ESS job 'Import autoinvoice', AR invoice is generated and So line status changed to Closed. At this stage, user has deleted the AR invoice by mistake and wants to generate a new invoice. SO line status is Closed and therefore we are unable to generate the invoice from 'Import Autoinvoice' process. How can we generate another AR invoice for this Sales order?

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