Table gets maintained via Zprogram although it is locked

Hi Experts,
I have one doubt ,i am maintaining one table suppose z22_ekko via SM30. As soon as i go to sm30 ,an entry gets created in Central Lock table by SAP
As you can see this entry (Transaction SM12)
Table is locked in 'Write Mode (E)' means no other user can maintain same table same time. In other session when i am trying to maintain via 'SM30' it is ok showing error 'Table is locked'. But when i try to maintain z22_ekko via a Z program with modify or Insert statement ,table gets modified although it is locked . How is it possible? If table is locked it should not allow user to modify via Zprogram also.
please clarify this doubt.
Regards,
A.Trivedi

Hi Ashish,
     If we try to visualise the SAP as a product deeply, we will realise that SAP is nothing but the same existing java .net c c++ technology where in it stores data using the similar RDMS concepts. Then what makes it different, Standardization of not only business process but also the way a developer diggs into the code. If using some standard function module we try to update a table it wont update it will say object is locked.
     Standard Procedure
          1.   Check object(table) is locked or not
          2a. If locked then show message
          2b. if not locked then lock the object
          3.   update/insert into table
          4.   unlock the table.
     Non Standard way(directly to step 3)
          update/insert into table
     So physically the tables are not locked using SM30. These are conceputally locked by lock objects using ENQUEUE and DEQUEUE. Hence we check these locks we will find the table as locked and we will not read it. Logically its always open.
For details try out this link
http://help.sap.com/erp2005_ehp_06/helpdata/EN/91/01274dc2e048d4b473fe5c45ae4e29/frameset.htm
I hope this might help you
HAPPY ABAPing
-VIshal

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>
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>
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