unit PkMop;

interface

uses Classes, SysUtils, Ora, OraPackage, System.Variants, OraUtils,
  System.Generics.Collections, Data.DB, OraClasses, JclSysUtils;

TPkMop = class(TCustomOraPackage)
  private
    FSession: TOraSession;
    procedure GetStoreProc;
    function GetSession: TOraSession;
    procedure SetSession(AValue: TOraSession);
    procedure SetParam(AParamName: string; AList: TList<Integer>); overload;
    procedure SetParam(AParamName: string; AList: TList<string>); overload;
    procedure SetParam(AParamName: string; AList: TList<Double>); overload;
    procedure SetParam(AParamName: string; AList: TList<Variant>); overload;
    procedure GetParam(AParamName: string; AList: TList<Integer>); overload;
    procedure GetParam(AParamName: string; AList: TList<string>); overload;
    procedure GetParam(AParamName: string; AList: TList<Double>); overload;
  protected
    StoredProc: TOraStoredProc;
  published
    property Name;
    property Session: TOraSession read GetSession write SetSession;
  public
    //тут сами вызовы 
  end;

implementation

constructor TPkMop.Create(AOwner: TComponent);
begin
  inherited;
  StoredProc := TOraStoredProc.Create(nil);
end;

procedure TPkMop.GetStoreProc;
begin
  StoredProc.Session := Session;
  StoredProc.StoredProcName := '';//ошибка вылетает тут
  StoredProc.Prepared;
end;

StoredProc.StoredProcName := 'имя процедуры';

property StoredProcName: string;