The POSTED_CODE field tells you if the InvoiceRecord has been posted or not so it's simply a case of iterating over the invoices and checking that field. The "MoveNext Method" help topic in the SDK documentation demonstrates how to enumerate records so would be a good place to start.

However, if you want to chase unpaid invoices you would likely not want want to base this on the posted status of the invoice. This is simply an indication of if the SI transactions have been generated for the invoice artefact or not. It does not indicate if the invoice has actually been issued to the customer, or if any payment is still outstanding on it. For this you need to look at the SI transactions themselves and check how much has been paid against it. The "Example - Find Invoice Payments" sample in the SDK documentation would be the best place to start as this is largely the approach I think you would actually need to take.

Hope that helps

Cheers Darron, sounds just what I was looking for.

thanks

jON