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Adjusting price after invoicing

Adjusting price after invoicing


A customer purchases a product and we ship it. They then see a price lower and would like us to price match.



Solution 1. We can do a credit memo with an adjustment refund for the difference.

Issue: Magento does not account for the decrease in actual sales and taxes associated with the lower price.

Solution 2: We can do a refund on the item (not return to stock) and charge an adjustment fee to make the price lower.
Issue: While the Grand total (excluding tax is correct) Magento refunds the total tax amount making the Grand total (including tax) wrong.

Am I approaching this work flow wrong?
Is there an easy way to do this (for both me and my customers) that will calculate/report tax correctly?