Alternative products can be seen under the 'Alternatives' tab within the requisition.
Items with a (P) next to them are created as stock products, whereas items with a (C) next to them are standard catalog items and are not set up as stock codes.
If the same code exists twice, one line with a (P) and another line with a (C) you should select the line with the (P) as the stock code exists for this item.
If the item only exists in the catalog (C) you will need to 'Make Product' in the requirement screen prior to purchasing.
*Please note, direct equivalent items will be shown under the 'Supplier' tab.