If your talking about changing the account on the vendor record then you could use a filter for the vendor profile "Last date modified"

If your talking about changing the account post EFT payment processing in Adagio and pre-transmission to your bank, then there is no report/process in Adagio to flag this occurrence.
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Douglas Dickie
AccSys Solutions Inc
Phone: 1.888.534.4344
ddickie@accsyssolutions.com