-- Function returns last viewed base report_id for specified page and region
function get_last_viewed_report_id
    ( p_page_id     in number
    , p_region_id   in number
    )
return number;

-- Function validates whether the report_id belongs to the region ID
function validate_report_id
    ( p_ig_id       in number
    , p_page_id     in number
    , p_report_id   in number
    )
return number;

-- Procedure adds Interactive Grid column filter using report_id.
-- If p_report_id is null, it adds filter to the last viewed report.
procedure add_filter
    ( p_page_id             in number
    , p_region_id           in number
    , p_filter_value        in varchar2
    , p_column_name         in varchar2 default null
    , p_operator_abbr       in varchar2 default null
    , p_is_case_sensitive   boolean     default false
    , p_report_id           in number   default null
    );
    
-- Procedure resets Interactive Grid to the factory default settings using report_id.
-- If p_report_id is null, it resets the last viewed report.
procedure reset_report
    ( p_page_id     in number
    , p_region_id   in number
    , p_report_id   in number default null
    );

-- Procedure resets Interactive report to the factory default settings using report_alias.
-- If p_report_name is null, it resets the last viewed report.
procedure reset_report
    ( p_page_id     in number
    , p_region_id   in number
    , p_report_name in varchar2 default null
    );

-- Procedure clears Interactive Grid filter(s) from all view for the given report ID
-- If p_report_id is null, it resets the last viewed report.
procedure clear_report
    ( p_page_id in number
    , p_region_id in number
    , p_report_id in number default null
    );

-- Procedure clears Interactive Grid filter(s) from all view for the given report ID
-- If p_report_name is null, it resets the last viewed report.
procedure clear_report
    ( p_page_id     in number
    , p_region_id   in number
    , p_report_name in varchar2 default null
    );

-- Procedure deletes a saved report.
-- It deletes a given saved report (public, private, alternative) except the Primary Default.
procedure delete_report
    ( p_application_id  in number default wwv_flow.g_flow_id
    , p_report_id       in number 
    );

-- Procedure changes owner of a non-primary saved report (public, private, alternative) for the current application.
procedure change_report_owner
    ( p_application_id  in number default wwv_flow.g_flow_id
    , p_report_id       in number
    , p_old_owner       in varchar2
    , p_new_owner       in varchar2
    );

Most procedures and functions in this package have 2 parameters in common: p_region_id and p_report_id.

p_region_id is the region ID of the Interactive Grid. The easiest way to get this is by making use of the region static id, in this example, emp and querying the APEX dictionary.

select region_id
  from apex_application_page_regions
 where application_id = 1560
   and page_id        = 10
   and static_id      = 'emp';

p_report_id should be provided if you wish to target a specific report. Usually however, you will omit this argument, and the action will be performed on the last viewed report. If you wish however to make use of it, you can easily find it by querying the apex_appl_page_ig_rpts view.

Note: The add_filter, clear_report and reset_reportprocedures have a second variant that accept p_report_name instead of p_report_id, making things much simpler.