Need to Lock PO in webdynpro for abap custom screen

Hi ,
I have one view containing one input field and one button and one table.when i enter PO number in input filed and click on button then the PO line item details will be displayed in table. i have created tcode for this webdynpro application.
Now
suppose one user by using this transaction code enters PO number and clicks on button then the PO information will be displayed in one table in the same view.
now my requirement is When another user enter the same PO number and click on button on the same time then the PO should be locked and need to raise message that '' PO is edited by another user''.
I have tried with standard lock object ie..ENQUEUE_EMEKKOS and DEQUEUE_EMEKKOS to block ekko when i click on button action code.But i could not make it.Please suggest me how can i handle this.
cheers,
sravan.

Dear Saravanan ,
Thank you for your reply.
Am passing PO Number as Key and launching the application from transaction code . The mode am using for the lock objects is 'E'.
please find below code to lock the PO.
CALL FUNCTION 'ENQUEUE_EMEKKOE'
EXPORTING
   MODE_EKKO            = 'E'
   MODE_EKPO            = 'E'
   MANDT                = SY-MANDT
   EBELN                = ls_atrb_node-po_number
EBELP                =
   X_EBELN              = ' '
X_EBELP              = ' '
   _SCOPE               = '2'
   _WAIT                = 'X'
   _COLLECT             = ' '
EXCEPTIONS
   FOREIGN_LOCK         = 1
   SYSTEM_FAILURE       = 2
   OTHERS               = 3
please correct me ,if i missed anything.
cheers,
sravan.

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Need to Lock PO in webdynpro for abap custom screen

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