For this case actually there is no invoice for 14004328/RI vendor knew on this but they already collected and deposit the chq and offset the duplicated payment with inv.14006437/RI.
Firstly they said will issue the CN to offset the over payment but today they said can’t do due to they already brought it to offset with inv.14006437/RI. which going to pay next round 5 Sep’14.
But will issue the letter instead to clarify that they received the duplicated payment from Dell.
So for this case can Dell adjust internally to use the duplicated payment to offset with inv.14006437/RI. ? and don’t pay them inv.14006437/RI.