When processing documents you need to select the stock item in the document lines section. There are basically three (3) options to select stock items in any open / unposted document:

1.Lookup - Click on the "Item no." column of document line or when proceeding to a new line, the Lookup will automatically be launched. To edit / select an existing Item, you need to double-click on the selected item in the document line. 

2.Open fast add - The icon will launch the lookup as a part of the "Document entry" screen (replace the header section of the document). Once finished selecting stock items, you may click on the Close fast add icon. 

You may enter a valid stock code, barcode or serial number and press the Enter key in the "Fast add item (stockcode / barcode/ serial)" field in the footer section of the "Document entry" screen screen. This will insert the stock transaction in the document line.

3.Button lookup - This will launch a graphical image view of Stock group 1 and Stock images. 

4.Accounts lookup - If you have added a Financial entry stock item type, you may select a general ledger account, debtor (customer / client) account or a creditor (supplier / vendor) account from the Accounts lookup when processing documents.