Method: IS_COND_EDITABLE
Method: COND_CHECK
Method: UPDATE_TERM_CALC_PAYMENT
Method: CHANGE_DUE_DATE
Method: CHANGE_ADD_TL_KOPO
Method: GET_NEXT_PERIOD_DATES
Method: UPDATE_PAYMENT_CALC_BALL
Method: UPDATE_BALLOON_CALC_PAYMENT
Method: IS_UPDATE_POSSIBLE
Method: GET_PAYMENT_PLAN