We are having an occasional problem when entering a new invoice into an open batch.As soon as we enter the customer number for the invoice instead of it appearing next in line under the previously entered invoices in that batch it will take the the place of an invoice already there and the invoice it replaced is now gone, no where to be found. It seems to be happening to only one workstation about once a week. Then yesterday when the invoices in an open batch were printed about half of them did not have the info that was entered in the text part of the invoice. Everything entered in the text part of the invoice was gone. I have run data integrity checks and everything comes up fine.