You can list the lower case letters and use the VALUES keyword:

"                            VALUES - Help

Type a list of values (up to 100 values) allowed for this field when
the operator types in it.  You must enclose in single quotation
marks any data you type in an alphanumeric field.  A numeric field
does not allow quotation marks.  Type + to obtain more space for the
keyword parameters.                                                 "

(from the Help on VALUES in SDA)

murali dhar wrote:
  In the display file, how will ensure that an input field takes values in 
lower case only?
Thanks

                
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