I can say "SELECT * FROM Invoices WHERE INVOICE_DATE > sysdate", but not INVOICE_DATE > sysdate - 1 (in any of its variations -- (sysdate-1), trunc(sysdate-1), trunc(sysdate)-1, etc.)
If using ODBC Access, I can say INVOICE_DATE > DATE()-180, but that syntax doesn't work with ODBC Oracle.
On a less positive note, is this beta software? The Import/Export wizard exports tables that cannot be re-imported. That's Microsoft SQL Server to Microsoft Access. Varchar(3)'s turn into Memos, and unless someone tells me differently, nothing will turn a Memo back into a Varchar(3).
Perhaps explicit data typing and conversion to a common data type for both the invoice date column and the calculated expression would faciliate the comparison you are attempting?
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