how can i remove undeposited funds?

If the sales receipt was double entered that would mean that the income as been doubled. You can go ahead to undeposited funds, click on the sales receipt and pull the entry into the deposit window. On the second line of the same deposit window make an entry against the income account in question with the same amount as the sales receipt, but with a negative number. This will clear the undeposited funds and reflect a $0.00 deposit in the register, as well as adjusting the income account. Hope this helps.