After reading this several times I am still confused regarding whether change of itinerary is allowed or not for an unused ticket but passed Departure Date. The language seems to say change is NOT allowed to the first segment? Or it only refers to the fare calculation since it mentions fare break?

The fare rules are for a refundable fare that is a ONE Segment ONE WAY A to B domestic itinerary. Hence the confusion I am having. Booking class is V. Fare code is VA0KY.

Here is what the rules say :

<<OR -
AFTER DEPARTURE OF JOURNEY AND WITHIN TKT VALIDITY
CERTAIN DOMESTIC REISSUE PROVISIONS MAY BE OVERRIDDEN BY
THOSE OF UA INTERNATIONAL FARES
NO CHARGE OR HIGHEST FEE OF ANY CHANGED FARE COMPONENT
WITHIN JOURNEY - CATEGORY 19 DISCOUNT APPLIES AND
REPRICE USING CURRENTLY TKTD FARE
PROVIDED ALL OF THE FOLLOWING CONDITIONS ARE MET-
1. NO CHANGE TO 1ST FLIGHT COUPON/FARE BREAKS
2. WHEN NO INTL COUPONS REMAIN - ALL NEW TRAVEL MUST
BE DOMESTIC
3. FULLY FLOWN FARE NOT REPRICED TO FURTHER POINT
4. UA FARES ARE USED
5. ALL RULE AND BOOKING CODE PROVISIONS ARE MET
6. VALIDATE ADVANCE RES REQUIREMENTS WHEN BOOKING
DATE KNOWN
7. ADV RES IS MEASURED FROM ORIGINAL TKT DATE TO
DEPARTURE OF PRICING UNIT
OR -
REPRICE
A. FULLY FLOWN FARE COMPONENTS USE FARES IN EFFECT
WHEN TKT WAS ISSUED
B. ALL OTHERS USE FARES IN EFFECT TODAY
PROVIDED ALL OF THE FOLLOWING CONDITIONS ARE MET-
1. NO CHANGE TO FARE BREAKS OF FULLY FLOWN FARE
COMPONENTS
2. WHEN NO INTL COUPONS REMAIN - ALL NEW TRAVEL MUST
BE DOMESTIC
3. FULLY FLOWN FARE NOT REPRICED TO FURTHER POINT
4. UA FARES ARE USED
5. ALL RULE AND BOOKING CODE PROVISIONS ARE MET
6. VALIDATE ADVANCE RES REQUIREMENTS WHEN BOOKING
DATE KNOWN
7. ADV RES IS MEASURED FROM NEW TKT ISSUE DATE IF
CURRENT FARES/FROM PREVIOUS TKT ISSUE DATE IF
HISTORICAL FARES TO DEPARTURE OF PRICING UNIT
OR -
REPRICE
A. CHANGED FARE COMPONENTS USE FARES IN EFFECT TODAY
B. ALL OTHERS USE CURRENTLY TKTD FARE
PROVIDED ALL OF THE FOLLOWING CONDITIONS ARE MET-
1. NO CHANGE TO FARE BREAKS UP TO THE FIRST CHANGED
FARE COMPONENT
2. WHEN NO INTL COUPONS REMAIN - ALL NEW TRAVEL MUST
BE DOMESTIC
3. FULLY FLOWN FARE NOT REPRICED TO FURTHER POINT
4. UA FARES ARE USED
5. ALL RULE AND BOOKING CODE PROVISIONS ARE MET
6. VALIDATE ADVANCE RES REQUIREMENTS WHEN BOOKING
DATE KNOWN
7. ADV RES IS MEASURED FROM NEW TKT ISSUE DATE IF
CURRENT FARES/FROM PREVIOUS TKT ISSUE DATE IF
HISTORICAL FARES TO DEPARTURE OF PRICING UNIT
WHEN CHANGE RESULTS IN LOWER FARE SUBTRACT RESIDUAL FROM
THE PENALTY THEN ADD-COLLECT/REFUND - REFUND VIA ORIGINAL
FORM OF PAYMENT
ENDORSEMENT BOX- HIGHER NON-REF AMT AND NEW ENDORSEMENTS.