To verify that a check has been issued:

1) Go to screen FAIVNDH
2) Enter the vendor number
3) Do a Next Block command (Ctrl-Page Down).
4) You will see all the invoices for the vendor you have selected.  Use the up or down arrow keys to identify the specific payment you are looking for.   

5) The check date will be in the column on the far right; to see the check number, tab over 9 times to view the Check column.