Cannot Use the words "yes' or 'No' in the value lists

I ma trying to use 'yes' and 'no' words in valuelists as follows;
[YesNo]
Y = Yes
N = No
But the forms does not disply the required words. If I use some other word other than 'yes' or 'no' , it displays those words in the form.
Is this a limitaiton on Dataface ? I think that these words are most usefull in common data entry and these are 'must' kind of words.
Is there ny workaround for this problem ?
[YesNo]
Y = Yes
N = No
But the forms does not disply the required words. If I use some other word other than 'yes' or 'no' , it displays those words in the form.
Is this a limitaiton on Dataface ? I think that these words are most usefull in common data entry and these are 'must' kind of words.
Is there ny workaround for this problem ?