I'll bet that the ".SVA" file is just a CSV file with a different extension formatted to be imported as an invoice batch into ACCPAC Plus.
Have you tried taking a look at the file in Notepad? If it loads and displays properly, then figure out the order of the fields in the file and create an Import Template for the file in Adagio Receivables. Then use File | Import | Invoices to pick up the transactions.
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Andrew Bates