TS 2014 Time in decimals

SOLVED

I have TS 2014.  We enter our time in decimals -- 10ths only (1 digit to the right of the decimal point).  Sometimes someone enters 2 decimal places by mistake which gets rejected by our clients' various electronic billing systems.  Is there a way to set TS to give an error message (or even better, to prevent) if someone enters more than 1 decimal place when entering time?