ICL_WITINSTANCE is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Instance Management of Third Parties for Notification" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_ICL_WITINSTANCE TYPE ICL_WITINSTANCE.
The ICL_WITINSTANCE table consists of various fields, each holding specific information or linking keys about Instance Management of Third Parties for Notification data available in SAP. These include FURTHER_TP (Capture Data on Other Claimants), CLAIMANT (Claimant)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .