What do the Different Colours Mean in the Document Flow Area?

When you are in the Document Flow area ready to approve your invoices for today you may notice that your entries are displayed in a different colour in this area. Please see the below on what the colours mean. 

Yellow Exception (Waiting for approval from PM) (These will be sitting in the Approval tab on the dashboard)
Green approved and ready to process 
White no approval needed and ready to process
Red/Pink has an exception on it but not in the approval process I.e has a vacated tenant