Error in DO_INSERT Function in Reserve Summary Report

Hi, I need to make a new Custom Reserve Summary Report which include additional parameter(along with existing parameters in the standard Reserve Summary Report).

I'm referring the standard RDF report only however the new custom rdf is throwing compilation error in one of the function-

function DO_INSERTFormula return Number is
begin

BEGIN
IF (:P_REPORT_TYPE = 'RESERVE' OR :P_REPORT_TYPE = 'REVAL RESERVE') THEN
Insert_Info (
:P_BOOK,
:P_PERIOD1,
:P_PERIOD2,
:P_REPORT_TYPE,
:P_ADJ_MODE,
:P_CONC_REQUEST_ID); --BUG 9215904
RETURN(1);
ELSE RETURN(0);
END IF;
END;
RETURN NULL; end;

Error - 'INSER_INFO' must be declared.