>I'm guessing the Report Writer is getting confused because in the UDF you are changing the value of the field that is part of the FOR clause. If I remember right, there seems to be some issues when you have filters set and use a FOR clause. I don't remember the specific combinations, but I do recall some problems that occur when you try to print from the preview.
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>I could definately suggest that you wait and update the records at the end of the report ......

Yes that wat I was doing, and that's how I solved it. No more preview and no more chance to print only some pages. Thanks for your time.