ORA-01422：精确提取返回超过请求的行数 -

Question

我不确定下面的代码是否有问题，我一直得到ORA-01422：确切的提取返回超过请求的行数。感谢帮助。

Procedure SignLetter(vletterid in number,vrtype  in number,vtitle in varchar,
 vclose in number,vuserid in number, vmodifyby in varchar2,Error out varchar)
is
vsigntype number(1);

begin

  insert into letterempinfo (id, letterid, empid,
   title, usertabid, modifyby)
  values ( s_letterempinfo.nextval,vletterid,vuserid,
   vtitle,vuserid,vmodifyby );

  if vrtype =1 then --preparer

    update letterheader
    set prepareid=vuserid,
     preparedate=sysdate,
     updatedate=sysdate,
     usertabid=vuserid,
     modifyby=vmodifyby
    where id=vletterid;

    if vclose =2 then

      update letterheader
      set letterstatusid=3,
       updatedate=sysdate,
       usertabid=vuserid,
       modifyby=vmodifyby
      where id=vletterid;

      vsigntype:=2;

    else

      vsigntype:=1;

    end if;

  elsif vrtype =2 then --preparer

    update letterheader
    set reviewerid=vuserid,
     reviewdate=sysdate,
     updatedate=sysdate,
     usertabid=vuserid,
     modifyby=vmodifyby
    where id=vletterid;

    update letterheader
    set letterstatusid=3,
     updatedate=sysdate,
     usertabid=vuserid,
     modifyby=vmodifyby
    where id=vletterid;

    vsigntype:=2;

  end if;

  PACKNOTIFICATION.SendLetterEmail(vletterid,vsigntype,Error);


exception when others then

  Error:=SQLERRM;

end;