problem msgbox

In excel, I have a userform with a lot of combo/text boxes, and a button "save".

I would like that when the user press "ad" or "save":
if "net o/t" box <>"" and "Nor_date"="" then a message box (with just OK button) saying "nor date is empty" appear, once OK press then focus goes to NOR_DATE box to allow user to fill it in

Here below my code under "save button", however this code make appears the msgbox but does not allow the user to fill in the empty box, it simply continues the code to SAVE_DATA....Can someone help?

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