This support Note explains Yellow, Pink and White colour highlighting in the Receiving register.
Yellow :- Purchase is an ORDER in MYOB
Pink :- Overdue orders (Promised Date is less than todays date)
White :- Purchase is a Bill in MYOB and is not overdue
Open :- No stock received
Closed:- All stock received or order has been marked as no further stock to receive
Split :-Partial stock has been received
For overdue (pink highlighting) please turn on the preference "Highlight Overdue Sale/Receive Orders" found in Tools, Preferences, General Tab. This preference is a per user preference.