A method for data access by a client device in a distributed network system having a central server system, at least one client device (C1, C2, Cn), and at least one business object server (BOS1, BOS2, BOSk), said at least one client device and said at least one business object server being coupled to the central server system via a communications network, a number of business objects (BO1-BOk) being stored in the at least one business object server, characterised in that - each business object server comprises a number of offices, each business object in the respective business object server being associated with one office (O1; O2; Om), - the central server system receives an access request message by the client device, said access request message comprising at least one unique client identifier and including information as to which business objects are to be read from the business object servers, - the central server system uses said client identifier to determine at least one access permission, an access permission indicating the offices and the business objects of said offices which the client device is entitled to access, - the central server system, once it has determined the offices in which the requested business objects are stored, generates access instructions for the business objects permitted to be accessed by the client device, which are defined in a standardised manner, disregarding the specific definition of the business object classes, the business objects of the respective office in the respective business object server being read, and transmitted to the client device, on the basis of said access instructions, said access instructions being translated into specific requests that are adapted to access the respective business object servers, and - the central server system harmonises the business objects prior to their transmission to the client device, said central server system comprising a transformation service for harmonising the read business objects, said transformation service, subsequent to the reading of the business objects, transforms the business objects by changing their structure from a server data structure to a client data structure and prepares these transformed business objects for transmittal to the client device, said transformation of the business objects from the server data structure to the client data structure being performed according to predetermined transformation rules, with each of said transformation rules indicating which data field of the server data structure is transformed into which data fields of the client data structure. - each business object server comprises a number of offices, each business object in the respective business object server being associated with one office (O1; O2; Om), - the central server system receives an access request message by the client device, said access request message comprising at least one unique client identifier and including information as to which business objects are to be read from the business object servers, - the central server system uses said client identifier to determine at least one access permission, an access permission indicating the offices and the business objects of said offices which the client device is entitled to access, - the central server system, once it has determined the offices in which the requested business objects are stored, generates access instructions for the business objects permitted to be accessed by the client device, which are defined in a standardised manner, disregarding the specific definition of the business object classes, the business objects of the respective office in the respective business object server being read, and transmitted to the client device, on the basis of said access instructions, said access instructions being translated into specific requests that are adapted to access the respective business object servers, and - the central server system harmonises the business objects prior to their transmission to the client device, said central server system comprising a transformation service for harmonising the read business objects, said transformation service, subsequent to the reading of the business objects, transforms the business objects by changing their structure from a server data structure to a client data structure and prepares these transformed business objects for transmittal to the client device, said transformation of the business objects from the server data structure to the client data structure being performed according to predetermined transformation rules, with each of said transformation rules indicating which data field of the server data structure is transformed into which data fields of the client data structure.