EL ? - Prevent two entries same bar

[Bill Keyer <bjkeyer@xxxxxxxxxxxxx>]

Can anyone offer a work around to prevent multiple entries 
in the same bar? -- First, I am dealing with daily data. 

Example: If I enter the day in a long position from the previous 
bar I would like to ONLY allow a reversal to short. I do NOT want
to allow a subsequent reversal back to a long position in the same bar.

Any help would be appreciated.
Bill Keyer