What would the log file contain - a list of the records? Unless you're using filtering, that's what your data source already contains. And how would you propose to use if for QC purposes? If records are skipped in error, any log file produced by the same merge process would be expected to skip those records too, with the result that you'd end up comparing an erroneous log against its equally erroneous output.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]