When you are in the check for payment printing window, you find out that the checkbox is grayed out.
Reason: The house bank check printing has been locked. The lock checks printing feature is to prevent simultaneous printing and or updating the checks for the same account by more than one user. This feature also avoids printing and or confirming checks using the same check number.
Solution: The "Lock Checks Printing" column is found in the menu: House Bank Accounts - Setup window; this is only visible for super users. Uncheck the checkbox, you will be able to print the check now.
Please also see SAP note: launchpad.support.sap.com/#/notes/2160843 for more detail. (Login credentials is required, S number and password)