I can't see any connection between what's in your mailmerge main document and the tutorial. For starters, the tutorial shows everything being enclosed in the fairly complex field coding, none of which is in your document. Furthermore, your «Customer», «Product» & «Price» mergefields are all in textboxes, which would cause problems even in any ordinary mailmerge.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]