Vacation Pay

SUGGESTED

I am new to the system and payroll.  We have employees accruing vacation.  When I paid vacation out to an employee this past summer I chose vacation 40 hours @ $25.50 instead of looking at the amount he had accrued and entering the amount.  Did I mess up the accrued vacation for this employee because he is in the negative today?  Since January he has taken 15 days off in vacation.  He does not always show up for a full week either so he is not accruing his full amount each pay week.  Please help...not sure if I messed up.  Thank you for any advice