Can I call popup on Field-Exit ?

Hi,

I create field-exit vorgang at MIRO and when the conditional begins, display a popup ( i used popup_to_confirm) but instead, An error occurred RPERF_ILLEGAL_STATEMENT.

So, if i really got it on field-exit a can't call screen, dialog, submit and use message W or I.

Someone can help with this, please i really need.

regards

Marcos Rodrigo