>Is there any way to take off the message 'invalid input' from the valid event of a field that returns .f.

Instead of RETURN .F. , RETURN 0, or SET CONFIRM OFF, but RETURN 0 is easier. The reason is that RETURN ANumber moves the object focus to that number. Example:

RETURN 1 goes tot he next field
RETURN 5 goes to the fifth next
REUTRN -1 goes to teh previous
RETURN 0 stays put