Create Ledes98 file after invoice is approved

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Hi, I hope somebody can help.

I have a client with some old unpaid invoices and now they are implementing Legal exchange for billing. Is there a way I can convert those PDF invoices that are already approved (3 years ago) to Ledes98 without having to manually make them again to then import to Ledes? I use Timeslips 2018.

Any advice would be appreciated.