Further to this problem, I feel all the settings are correct. The thing I am suspicious of is the number of items in the invoices. This customer routinely does invoices with 350 to 500 items per invoice. The batch we are trying to post has 371 items in one invoice and 444 items in the second. This customer had no problems doing this with DOS Quick Invoice. Would it be possible to send the data to support and have them try to post the batch? That would remove any possibility of the network or workstation being the cause of the problem.