Can any please explain ?

['Scott Smith']

Can some please tell me why: 

IF (Input table)

@wlfd3::dd (30,*) = draw(@af)
:dd eq "Bank" : draw(@af) = "Bank Cheque"; display
::end

And in Screen if 

The d3 field is entered as : "Bankorsomething name "

Then it changes to "Bank Cheque"

The dd should be the whole field yet the equals is only seeming to compare
the starting first part of the field.

Thanks

Scott Smith