شجرة النظام ... ما الخطأ في الكود ... موضوع هام للنقاش

بسم الله الرحمن الرحيم
اخواني الاعزاء , انا الانى بصدد انشاء شجرة للنظام الذي اعمل عليه , وقررت انشاء شجرة
لهذا النظام , وقمت بعمل الاتي : -
بدايتا انشاء هذه ال view

create or replace view tree_aa  as
select  'a0' as parint,'b1' as childer,'Preparing System'   as name_ar from dual
union all select  'a0' as parint,'b2' as childer,'Main File System' as name_ar from dual
union all select  'a0' as parint,'b3' as childer,'Report System'  as name_ar
from dual
union all select  'a0' as parint,'b4' as childer,'Help '  as name_ar
from dual
union all select  'b1' as parint,'c1' as childer,'Divisions' as name_ar from dual
union all select  'b1' as parint,'c2' as childer,'Categories' as name_ar from dual
union all select  'b1' as parint,'c3' as childer,'Jobs'as name_ar from dual
union all select  'b1' as parint,'c4' as childer,'Users' as name_ar from dual
union all select  'b1' as parint,'c5' as childer,'Employees' as name_ar from dual
union all select  'b2' as parint,'d1' as childer,'Display Assets' as name_ar from dual
union all select  'b2' as parint,'d2' as childer,'Delete Assets' as name_ar from dual
union all select  'b2' as parint,'d3' as childer,'Request And Replay Assets' as name_ar from du
union all select  'b3' as parint,'e1' as childer,'Divisions' as name_ar from dual
union all select  'b3' as parint,'e2' as childer,'Categories' as name_ar from dual
union all select  'b3' as parint,'e3' as childer,'Jobs' as name_ar from dual
union all select  'b3' as parint,'e4' as childer,'Users' as name_ar from dual
union all select  'b3' as parint,'e5' as childer,'Assets' as name_ar from dual
union all select  'b3' as parint,'e6' as childer,'Delete Assets' as name_ar from dual
union all select  'b3' as parint,'e7' as childer,'Request' as name_ar from dual
/

طبعا ناتج هذه ال view هو :-

 STATE	  LEVEL NAME_AR				   N TO
------- ---------- ------------------------- - --
1		  1 Preparing System			b1
1		  2 Divisions				   c1
1		  2 Categories				  c2
1		  2 Jobs						c3
1		  2 Users					   c4
1		  2 Employees				   c5
1		  1 Main File System			b2
1		  2 Display Assets			  d1
1		  2 Delete Assets			   d2
1		  2 Request And Replay Assets   d3
1		  1 Report System			   b3
STATE	  LEVEL NAME_AR				   N TO
------- ---------- ------------------------- - --
1		  2 Divisions				   e1
1		  2 Categories				  e2
1		  2 Jobs						e3
1		  2 Users					   e4
1		  2 Assets					  e5
1		  2 Delete Assets			   e6
1		  2 Request					 e7
1		  1 Help						b4

وقمت بانشاء شاشة للشجرة , وبصراحة لا اعلم سبب عدم ظهور الداتا على الشجرة وسأقوم
بارفاقها ....
يظهر مسج لي استعلام غير مقبول للشجرة الهرمية frm-473131
ارجوا التكرم بمساعدتي ...

tree2008.zip