A method of handling weight data in a data processing system involves acquiring and storing weight data of an item. A verification information is generated for the item based on the weight data, where the verification information is associated to the determined weight, the generation of the verification information including one of the following steps: a) encrypting the weight data where the verification information corresponds to the encrypted weight data, or b) determining a first message authentication code where the verification information corresponds to the first message authentication code, wherein when using the weight data the validity of the weight data for the item is verified by use of the verification information and if the weight data is verified as being valid weight data, a graphic representation of the weight data is generated.