What happens to table when file is transfering ?

There is code in Z-program which puts a 'Z' in the blocked field of ZCCOD whenever a file is transmitted.
I mean file is transfering from SAP to mainframes
Can anybody tell what happens if the table is in <b>edit mode</b> (e.g., via SM30) at the time of transmit? Do the changes get lost or do they get queued up or what?
Could you please you please explan in detail. You correct(no guessings please ) explanation is highly appreciated.

The Z-Program will update the database irrespective of the table being edited in SM30. The user wont see the updated data until he comes out of the existing transaction and goes back again.
<b>Nothing is queued up.</b>
Also if the program updates the data and if the user editing the table in SM30 saves his changes, the changes made by the Z-program will be overwritten.
The best way to avoid this problem is to add a check in your Z-program. Use the function ENQUEUE_READ to check if the table key the program is trying to update is locked and perform further processing.
-Kiran

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