Abstract: In a computer system (1), generated (S2) is a visual code which encodes reference information for identifying a data object linked to a person. Using a camera of a mobile communication device (2), the reference information encoded in the visual code is captured from a visual representation of the visual code and stored (S5) in the mobile communication device (2). In the mobile communication device (2), generated (S8) is a data package which includes the captured reference information and an image (23) of a document (4) of the person. The data package is transferred (S9) from the mobile communication device (2) to the computer system (1). In the computer system (1), the image of the document (4) is stored (S11) linked to the data object (10), defined by the reference information received in the data package.