Send hot key not work when screen lock

When my screen locked after insert few records hot key not working.In hot key I used Tab.
I used different approach for this
1.Used hot key for tab with click send error message.if any one reply me use simulate click.FYI there is no simulate click in hot key.
2.Used Type into with and add tab send window message
But not work.
I execute BOT for 8 hours with screen locked its execute successfully.But when I used Tab in hot key then it not able to work
Can any one suggest there is any way we use tab.
I stuck in this issue from last two month but did not got solutions.

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