No matching records found 'AR Down payment invoice'

Hello,

We are on SAP B1 2005A PL50.

We have entered AR downpayment invoice copied from a sales order. Then we entered sales delivery copying from the same sales order.

On the AR invoice screen upon clicking the 'Total downpayment' we get the message : "No matching records found 'AR downpayment' (ODPI) ODBC -2028.

Please advice on what could possibly cause this.

Thanks & Regards,

Asif