For others reading this, it may be you want to backdate invoices to June, or issue credit notes in July for invoices posted in June. In Adagio, you could perform this maintenance:
1) Copy your existing tax table(s) and create new ones with a code that makes it obvious what it's purpose it, such as 'CAN7'. Doing this will make sure the GL tax accounting will remain in place.
2) Edit your tax table(s) for the new tax rate. At this point, all new documents will calculate with the updated tax.
3) If you need to use 7% tax for a document, simply edit the Tax Table and choose the one created in step 1 by copying your existing tax tables.
These copied tax tables are only necessary during this transaction time. All of customers already are set to use existing tax tables, so these new tables are only necessary for the 'exceptions'.
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Regards,
Softrak Tech Support