Dear Experts

I have these codes

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messagebox(transform(inc_per))			&& thiss dispaly the value =4.5
thisform.container200.text20.value=inc_per		&& this dispalys the value =4.5
thisform.container200.combo5.value=inc_per		&& but the value of variable inc_per is not showing in combo

textbox is getting variable value but combox is not getting.

Here are two images attached also

Please help me what i am doing wrong?