You get this screen when you press ALT + O or click button "-O Opt Voucher" in the Purchase Challan (Receipt Note)
This is similar to Purchase Transaction Option.
Scenario: You might have some products that has user defined code and some products with default barcodes. At the time of billing both the products needs to be scanned.
Solution: Added an option “Default + User Defined Code” in Scan Field List for following voucher option.
●Sale Order
●Sale Challan
●Sane Invoice (Scan POS)
●Sale Return
●Purchase Return
●Rejection In
●Rejection Out
●Stock Transfer Indent
●Stock Transfer
●Stock Journal
●Physical Stock