A reporting method for a multi-client telecommunication network, the network comprising a plurality of client devices (910, 912, 914, 916) and a reporting telecommunication server, the reporting method being implemented by the reporting telecommunication server and comprising: - receiving a request from one of the client devices; - generating a first report (110, 701), the first report being a data object having assigned one or more first selection criteria (SC2, SC3), and one or more (SC7, SC8, SC12) of a plurality of second selection criteria (SC4-SC13), the first report comprising aggregated data objects retrieved from at least one first database table (306, 718, T1.A, T1.B, T1.C) by using the first selection criteria, whereby a database table assigns at least two pieces of information to each other; - sending a first graphical representation of the first report with the retrieved aggregated data objects to the one client device via the network for display on a screen of said one client device; - receiving a user's selection of one of the displayed aggregated data objects via the network; - accessing a mapping, the mapping assigning each second database table of a plurality of second database tables (326, T2, T3, T4) a sub-set ({SC4, SC5, SC6}; {SC7, SC8, SC12}; {SC9, SC10} {SC8, SC10, SC11, SC12, SC13}) from the plurality (SC4-SC13) of second selection criteria, each second selection criterion defining the identification and retrieval of data stored in the second database table (326, T2, T3, T4) assigned in said mapping to said second selection criterion; - retrieving detailed information of the selected aggregated data object by a sub-method a); and - sending a second graphical representation of a further report for display to the client device, wherein the further report comprises said detailed information; wherein sub-method a) implemented by the reporting telecommunication server comprises: - identifying, by evaluating the mapping, all (326, T3, T4) second database tables (326, T2, T3, T4) having assigned at least one of the second selection criteria assigned to the first report; - identifying, by further evaluating the mapping, all second selection criteria (SC6, SC7, SC12, SC8, SC9, SC10, SC13) contained in any one of the second selection criteria sub-sets assigned to any one of the identified (326, T3, T4) second database tables; - sending the identified second selection criteria to a second report (324, 802), the second report being a data object configured to select any information identified by any sent second selection criteria (SC4-SC13) from any one of the second database tables (326, T2, T3, T4); and - retrieving information (808.1) identified by the sent second selection criteria (SC6, SC7, SC12, SC8, SC9, SC10, SC13) from the identified (326, T3, T4) second database tables; - supplementing the second report with said retrieved information (808.1); and - using said retrieved information as the detailed information and using said second report as the further report. - receiving a request from one of the client devices; - generating a first report (110, 701), the first report being a data object having assigned one or more first selection criteria (SC2, SC3), and one or more (SC7, SC8, SC12) of a plurality of second selection criteria (SC4-SC13), the first report comprising aggregated data objects retrieved from at least one first database table (306, 718, T1.A, T1.B, T1.C) by using the first selection criteria, whereby a database table assigns at least two pieces of information to each other; - sending a first graphical representation of the first report with the retrieved aggregated data objects to the one client device via the network for display on a screen of said one client device; - receiving a user's selection of one of the displayed aggregated data objects via the network; - accessing a mapping, the mapping assigning each second database table of a plurality of second database tables (326, T2, T3, T4) a sub-set ({SC4, SC5, SC6}; {SC7, SC8, SC12}; {SC9, SC10} {SC8, SC10, SC11, SC12, SC13}) from the plurality (SC4-SC13) of second selection criteria, each second selection criterion defining the identification and retrieval of data stored in the second database table (326, T2, T3, T4) assigned in said mapping to said second selection criterion; - retrieving detailed information of the selected aggregated data object by a sub-method a); and - sending a second graphical representation of a further report for display to the client device, wherein the further report comprises said detailed information; - identifying, by evaluating the mapping, all (326, T3, T4) second database tables (326, T2, T3, T4) having assigned at least one of the second selection criteria assigned to the first report; - identifying, by further evaluating the mapping, all second selection criteria (SC6, SC7, SC12, SC8, SC9, SC10, SC13) contained in any one of the second selection criteria sub-sets assigned to any one of the identified (326, T3, T4) second database tables; - sending the identified second selection criteria to a second report (324, 802), the second report being a data object configured to select any information identified by any sent second selection criteria (SC4-SC13) from any one of the second database tables (326, T2, T3, T4); and - retrieving information (808.1) identified by the sent second selection criteria (SC6, SC7, SC12, SC8, SC9, SC10, SC13) from the identified (326, T3, T4) second database tables; - supplementing the second report with said retrieved information (808.1); and - using said retrieved information as the detailed information and using said second report as the further report.