No value for ShipAmount. For more details, see http://sellercentral.amazon.co.uk/gp/help/24981
This error occurs when you specify a type of shipping in your shipping overrides file or overrides feed (XML) but fail to specify a corresponding override shipping amount. For example, if you are uploading a tab-delimited shipping overrides file which contains a value for Type2, you must also provide a valid value for ShippingAmt2.
To resolve this error, please resubmit your data making sure to provide a valid shipping amount for each override type.