Check the OE Company Profile. There is a setting called 'Receivables batch type' for Day End to either directly create Invoice batches for AR, or write to an Invoice Retrieval file. There is no option to directly write to the customer files. Choose the option you prefer.
Go in to AR and you should either see Invoice batches waiting to be posted, or a retrieval batch that can be brought in from the Maintenance menu and Retrieve Transaction Batches (Invoices).
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Regards,
Softrak Tech Support