If you are clicking purchase and the item is not leaving the requirements, this is due to the item not having stock code.
In order to purchase this item, double click into the line you are trying to purchase to open the requisition and then select the 'Make Product' button. You will then be asked to create the stock code for this item.
If an error message is returned when trying to make the product, this is usually due to the stock code already existing on the system. To check this go to stock - products and search for the code that you are trying to create, if this product is returned in the results you will need to discontinue this code and re-create the item from the imported order.
If the item does not show, change the status in the drop down to 'Discontinued' and search again. You will then need to add the pre-fix DIS to this stock code..