Hi, Jennifer,
You are able to see this information in the Customer transactions grid; however, there is no specific spec code for it at this time. If you really want to be able to see the Invoices PO # in an AR statement, you could send it via the Invoices Reference field or the 1st or 2nd Description field and use codes D4, D10 or D19 respectively. To do this, edit your Invoices Company Profile and, on the Print/Post tab, set the 'Send to AR' Reference, Description 1 or Description 2 option to 'PO Number'.
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Regards,
Softrak Tech Support