Japanese to English Bus/Financial Finance (general) Account records

Good afternoon. In the 'Settlement date'（勘定日）column of an 'Ordinary deposit ledger'（普通預金元帳), next to various (but not all) of the dates entered, I keep finding the notation 'キ' (as in 29 [or 2017]/11/15 キ). It doesn't seem to have anything to do with payment through an ATM (as in 支払機), since many of the dates in the Settlement date column refer to ATM payment in a corresponding column, but do not carry the notation ’キ.'
Any help appreciated.