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I started a brand new return and went straight to stack sales and entered a sale.  It does come up with an edit button in the sales summary, but there is no way to delete it that I can find short of deleting whole forms.  No 
Delete button!  So, Im not sure why I cannot modify entries on my nearly completed return but it looks like if I start all over again I might be able to modify but not delete sales entries if I want to.