### Title

Validate Length

### Post

I've got two types of data in one field. The character length for data type A is 10 digits, the character length for data type B is 14 digits. I'm trying to restrict data entry to either 10 digits or 14 digits. I've tried the following validation formulae.

IsEmpty ( Self ) or ( 9 < Length ( Self ) and Length ( Self ) < 15 )

and,

Case ( IsEmpty ( Self );Length ( 10 );Length ( 14 ) )

Neither of these work. Am I on the right track or totally wrong?

What about:

IsEmpty ( Self ) or Length ( Self ) = 10 or Length ( Self ) = 14