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If the total appears in Green, this indicates that you have the authority to create a purchase order for that amount. In this case you will be presented with a Generate Purchase Order button, which when pressed, will approve any non-declined lines and create a purchase order.
If the total appears in Red, this indicates that the total amount of the requisition is above your authority limit. In this case you will be presented with a list of your managers and an Approve and Send button. By pressing this button you are forwarding on the Request up the line to someone who may have the authority to create a purchase order for the request.
You will be presented with a text box, allowing you to add any comments or thoughts that your manager can review to help them make their decision to approve or not.