Searching for Business Partner Documents

You can search for certain documents tied to a Business Partner 

Up at the top on the Account Balance line there is a golden arrow. If you click on that it will open a list of A/P Invoices and Outgoing Payments. If you take the checkmark out of Posting Date and Display Unreconciled Trans. Only, it will list the last 50 documents. In this screenshot I changed it to 200

You can click on the gold arrow for the Origin No. and it will bring up the invoice. 

Trans. No. is the Journal Entry. 

Office Account will bring up the Chart of Accounts. 

If you double click on the column at the top it will sort them ascending / descending.