unaided awareness with DTA and validation

starttable: 5
desc: <Unaided Awareness>
intro: What rental property managers are you aware of?
instructions: Please list as many as you can think of (up to 5).
type: text
rowsfrom: system.1to5
template: show_text_rows.tx
dta: y
dta_text: I don't know any.
required: n 
validate: anyChecked($T5_DTA) or $Q5R1 ne ''
message: Please enter at least one rental property manager you are aware of or select "I don't know."
endtable