To add log record use command item/add_log_record:

svc=item/add_log_record&params={"itemId":<long>,
				"action":<text>,
				"newValue":<text>,
				"oldValue":<text>}

List of available actions:

• custom_msg;
• create_unit;
• update_name;
• update_access;
• update_unit_icon;
• update_unit_pass;
• update_unit_phone;
• update_unit_calcflags - update sensor calculation settings;
• update_unit_milcounter - update mileage counter value;
• update_unit_bytecounter - update GPRS traffic counter value;
• update_unit_ehcounter - update engone hours counter value;
• update_unit_uid;
• update_unit_hw - update hardware type;
• update_unit_hw_cfg - update hardware configuration;
• update_unit_fuel_cfg - update fuel concumption configuration;
• update_unit_trip_cfg - update trip detection configuration;
• create_sensor;
• update_sensor;
• delete_sensor;
• create_alias - create command;
• update_alias - update command;
• delete_alias - delete command;
• create_service_interval;
• update_service_interval;
• delete_service_interval;
• create_custom_field;
• update_custom_field;
• delete_custom_field;
• import_item_cfg;
• import_unit_cfg;
• export_unit_msgs;
• import_unit_msgs;
• delete_unit_msg;
• delete_unit_msgs;
• bind_unit_driver;
• unbind_unit_driver;
• update_unit_report_cfg - update parameters used in reports;
• update_msgs_filter_cfg - update filtration of unit position information in messages;
• delete_item;
• create_user;
• update_hosts_mask;
• update_user_pass;
• update_user_flags;
• create_user_notify;
• delete_user_notify;
• create_group;
• units_group - add/remove units into group;
• update_driver_units - update the list of auto attachable units for drivers;
• create_resource;
• create_zone;
• update_zone;
• delete_zone;
• create_poi;
• update_poi;
• delete_poi;
• create_job;
• switch_job;
• update_job;
• delete_job;
• create_notify;
• switch_notify;
• update_notify;
• delete_notify;
• create_driver;
• update_driver;
• delete_driver;
• create_drivers_group;
• update_drivers_group;
• delete_drivers_group;
• create_report - create report template;
• update_report - update report template;
• delete_report - delete report template;
• import_pois;
• import_zones;
• create_retranslator;
• update_retranslator;
• units_retranslator - add units for tertranslation;
• switch_retranslator;
• create_route;
• update_route_points;
• update_route_cfg;
• create_round;
• update_round;
• delete_round;
• create_schedule;
• update_schedule;
• delete_schedule;
• create_account;
• delete_account;
• switch_account;
• update_dealer_rights;
• do_payment;
• update_account_flags;
• update_account_min_days;
• update_account_plan;
• update_account_history_period;
• update_account_subplans;
• create_service;
• update_service;
• delete_service.

{}	/* empty object if execution successful, if not - error code */