Hi Steve,
Indeed changing the Spec Style on an Adagio Invoices item will not be propagated using Update Archive Batches. I can forward this suggestion to R&D. I think this would be the last field of interest that could be updated from this function for Invoices items, but if you have other thoughts then please let us know.
As for what is possible now, if you export the archive batch and then re-import it as is, the newly updated spec style will be read onto the new batch, as the style is always re-read from the item. Use either format 6 or 7 for the most information possible in the batch, and when exporting, choose to export all the customer/detail information so that the imported batch does not re-read the master records but rather the original batch info is maintained.
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Regards,
Softrak Tech Support