Clear Input Field

I need to clear the input field on the screen, if the input by the user is invalid. This is a generic code and need to be used in many screens. I would not really like to hard code the field names in the code to clear the input field (in the PAI event of the screen). Is there a way to use SCREEN-NAME variable to clear the input field dynamically whose name is stored in SCREEN-NAME variable?

Any help would be highly regarded !!!!