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If wrong type of information is pasted in the Insert Records dialog and "OK" button is pressed, then netbeans shows error window for every cell times every row where error is present. In the error window there is just an "OK" button to acknowledge this problem and continue to next error. I just had to press that button 4 x 248 times. An option to cancel import in that error window would have been very handy.
Oops, that was during paste to Insert Records dialog.