The number of the deposit account into which the check is deposited using the cash-back would not be listed, because there is no cash transaction affecting the account. The cash transaction is the partial cashing of the check.
If that check happens to be an on-us item, however, you should list that account on which it's drawn.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8