Editable ALV - how to raise errors ?

Hi,
I have a screen with some fields.
And below it I have a custom container with an Editable ALV (Classical ALV).
since the ALV is editable, the values entered gets validated. and upon finding a wrong entry, If I throw an error from ALV, the transaction aborts. The error is being raised from data_changed_finished event.
I dont understand the reason why.
Are you not supposed to raise an error through the ALV ?
In the Data_Changed event, I chose the cl_alv_changed_data_protocol object to write logs.
But what if I need to raise an error else where in the alv flow.. say in user command of the alv.
Rgds,
Prashanth.

Hi raja,
Exactly like what zhenglin gu said. Error msg is thrown successfully. But if user tries to do anythign following that, like enter some other data or even a simple mouse click on teh alv, it aborts. No warning or message is thrown. it simply aborts.
And there is nothign specific about the error message.
Currently i have removed teh code for throwing the error msg.
But nothing v specific abt it...
Message e008(/NAM/NAE_MESSAGES).
Seems like some problem with the way alv and the screen talk to each other or something like that ? Or is there a way to handle this ?
Rgds,
Prash.

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Hi all,
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Skipping processing of the chain block will not stop the message from coming as the message is raised from the domain level. If you mean that among other things I need to delete that message from the protocol then in that case the changed value strangely does not get deleted. It comes back to the value which has been put before deleting it...

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Hi,
Thanks for your answer. I already saw this post.
See this method.
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Dear Olaf,
 If understood correctly, you want to Edit an ALV and do some data validations when some data is changed in an ALV. To do this follow the following steps:
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EXPORTING
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IF wa_orders-zfstfirmtyp = c_9.
MESSAGE s288(zcsp).
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Regards
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