Unable to use EIT in Transformation Fast Formula

Hi Team,
I am trying to write HDL transformation fast formula to load the Person EIT data, but system is giving syntax error for FLEX:PER_PERSON_EIT_EFF.
Getting error in mapping the position to metadata at line "FLEX:PER_PERSON_EIT_EFF = trim(POSITION6) "
Fast formula code -
INPUTS ARE OPERATION (text), LINENO (number), LINEREPEATNO (number),
POSITION1 (text), POSITION2 (text), POSITION3 (text), POSITION4 (text),
POSITION5 (text), POSITION6 (text), POSITION7 (text), POSITION8 (text), POSITION9 (text), POSITION10 (text)
DEFAULT FOR POSITION1 IS 'NO DATA'
DEFAULT FOR POSITION2 IS 'NO DATA'
DEFAULT FOR POSITION3 IS 'NO DATA'
DEFAULT FOR POSITION4 IS 'NO DATA'