can't traffic between same security level interfaces

hello dear experts,
i have installed asa5520 and his software version is 8.3(1).
there is 2 difference interfaces with same security level 100 (DMZ and inside).
and configured same-interface-traffic permit inter-interface
But i can't reach traffics between each other.
our asa's configure is below:

ASA# sh run
: Saved
:
ASA Version 8.3(1)
!
hostname ASA
!
interface GigabitEthernet0/0
 nameif inside
 security-level 100
 ip address 192.168.100.254 255.255.255.0
!
interface GigabitEthernet0/1
-----more------
!
interface GigabitEthernet0/2
------more------
!            
interface GigabitEthernet0/3
 nameif DMZ
 security-level 100
 ip address 172.29.0.254 255.255.255.0
!
interface Management0/0
 nameif management
 security-level 100
 ip address 192.168.1.1 255.255.255.0
 management-only
!

access-list DMZ_access_in extended permit ip any any

access-list inside_in extended permit ip any any

access-group inside_in in interface inside

access-group DMZ_access_in in interface DMZ