Another great feature for #GP2018R2 is in Financials. In Checkbook Maintenance the option to allow or not allow Duplicate Check Numbers has been extended to Bank Transaction Entry, Payroll Manual Checks and Miscellaneous Checks. This means that if this option is not checked duplicate checks are not allowed in these three windows. Previously, this option only applied to Payables checkbooks but now it includes:

Bank Transaction Entry
Payroll Manual Checks
Miscellaneous Checks