Connect Payment and Invoice

Can anyone help me with info on where to find a connection between payments and paid invoices. In the most obviouse places, Cust. Ledger Entry and Detailed Customer Ledger Entry we have a lot of records without information on corresponding document but the invoices are still closed. I do not know how our customer have managed to do this and I am totaly stuck. Thanks for the help Draggan

http://www.mibuso.com/forum/viewtopic.php?t=7858&highlight=payment+invoice maybe this helps…