Turkish Airlines Ombokning till tidigare datum

Hej!

Vi har biljetter från Turkish airlines i Economy restricted.
Biljetterna är ombokningsbara.

1. Men frågan är;
Kan man boka om till ett tidigare datum, än nuvarande avresedatum?
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2. Ombokningsavgift:
Om man bokar om både av-resa och hemr-esa på samma gång, Blir det då två eller en ombokningsavgift?

Hoppas någon har svar på våra frågor... =)
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Här är boknings reglerna om någon förstår samtliga regler.

FN1/P16
QUOTE01
01 CPH-BKK SA-11june11 TK NUC 245.55 TDKPX3M
16. PENALTIES
FOR ROUND TRIP INSTANT PURCHASE FARES
CHANGES
ANY TIME
CHARGE EUR 50.00 FOR REISSUE/REVALIDATION.
CHILD/INFANT DISCOUNTS APPLY.
NOTE -
CHARGES SHALL NOT BE WAIVED FOR MEDICAL REASON
CHARGE EUR 100.00 FOR NO-SHOW.
CHILD/INFANT DISCOUNTS APPLY.
NOTE -
CHARGES SHALL NOT BE WAIVED FOR MEDICAL REASON
TICKET IS NON-REFUNDABLE IN CASE OF NO-SHOW.
NOTE -
NOT PERMITTED EVEN FOR MEDICAL REASON
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FOR TICKETING ON/AFTER 01NOV2010
ANY TIME
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FOR NON REFUNDABLE TICKETS THE -YR- SURCHARGE
WILL NOT BE REFUNDED.
BEFORE DEPARTURE
CHARGE EUR 100.00 FOR CANCEL/REFUND.
CHILD/INFANT DISCOUNTS APPLY.
NOTE -
CHARGES SHALL NOT BE WAIVED FOR MEDICAL REASON
AFTER DEPARTURE
CANCELLATIONS PERMITTED FOR CANCEL/REFUND.
NOTE -
FOR CANCELLATIONS AFTER DEPARTURE THE REFUND GIVEN
WILL BE THE DIFFERENCE BETWEEN THE FARE PAID AND
THE APPLICAPLE FARE FOR THE JOURNEY FLOWN.
APPLICABLE FARE FOR THE JOURNEY FLOWN IS THE ONE
THAT SET AT THE SAME RBD WITH THE ORIGINAL FARE
PAID.
IF NO FARE EXISTS FOR THE FLOWN JOURNEY
ON THE SAME RBD WITH THE ORGINALFARE
ANY FARE SET ON A HIGHER RBD WILL BE ACCEPTED.