Hi Edward

Assuming the invoice date is the same for the whole batch of invoices...

Launch Invoices using the invoice date as the system date. "Move" the batch of invoices over to Archives, then run Maintenance | Update Archive Batches, select the batch range, check off the box Item dates, and Process. It will mass update the item dates to match the system date. Then restore them to Invoices without revising the date fields or document number.

Steve