Solution : https://service.sap.com/sap/support/notes/883533 (SAP Service marketplace login required)
Key words : 
deleted_flag          man varchar     unicode     1due_date             opt timestamp              26external_object_id   opt varchar     unicode   255execution_url        opt varchar     unicode  1024expiry_date          opt timestamp              26external_type        opt varchar     unicode   255flags                opt integer                10item_type            man varchar     unicode   255priority             opt integer                10status              opt varchar     unicode    50subject              opt varchar     unicode   255group_action          opt varchar     unicode  1024in, tablename = 'kmc_uwl_item'columnname          mode datatype    codetype  length------------------------------------------------------item_id              key fixed                  19i_connector_id      opt integer                10system_id            man varchar     unicode    25external_id          man varchar     unicode   300user_id              opt fixed                  19app_context          opt varchar     unicode   255attachment_count    opt integer                10created_date         opt timestamp              26creator_id          opt varchar     unicode   255description          opt long        unicode, execution_url varchar, group_action varchar, timestamp reason, 'timestamp', alter table kmc_uwl_item modify, complete length, rowsize---------------------kmc_uwl_item  8172the table, select tablename
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