Your field is two bytes long, whatever your definition.
If the P is correct, you can't represent that in Easytrieve directly, as far as I am aware.
If you need to include it in a report, you'll have to define an additional field.
Something like this:
file-field position 2 P 3
to-use-file-field file-field position 2 P 0
w-print-file-field W 5 A.
w-always-zero w-print-file-field 1 A VALUE ZERO
w-copy-of-file-field w-print-file-filed +1 3 N
w-copy-of-file-field-sign w-print-file-filed +4 1 A
w-copy-of-file-field = to-use-file-field
If the file-field is less than zero, assign "-" to the new sign field, else blank or "+" as you want.