A Contract's status may prevent you from editing the Contract's Details Window. When a Contract's status is Cancelled no fields on the details window are accessible. Also, during various phases of a Contract's Life Cycle certain fields cannot be accessed; for example, when a Contract has expired the Contract Type, Total Estimated Value, Total Yearly Value, Vendor etc. are not accessible or editable. For more information about the which fields are accessible throughout the Contract Life Cycle see the section on Contracts Detail Tab.