So, The "Green Line" Is Movable?

Found here:

Exchange of territory:

According to Article 6 Israel received a territory in the area known as Wadi Ara and the Little Triangle in exchange for territory in the southern hills of Hebron. [7] In March 1949 as the Iraqi forces withdrew from Palestine and handed over their positions to the smaller Jordanian legion, 3 Israeli brigades manoeuvred into positions of advantage in Operation Shin-Tav-Shin. The operation allowed Israel to renegotiate the cease fire line in the Wadi Ara area of the Northern West Bank in a secret agreement reached on 23 March 1949 and incorporated into the General Armistice Agreement. The green line was then redrawn in blue ink on the southern map to give the impression that a movement into green line had been made. [8]

The events that led to a change in the Green line was an exchange of fertile land in the Bethlehem area to Israeli control and the village of Wadi Fukin being given to Jordanian control. On 15 July when the Israeli Army expelled the population of Wadi Fukin after the village had been transferred to the Israeli-occupied area under the terms of the Armistice Agreement concluded between Israel and the Jordan Kingdom The Mixed Armistice Commission decided on 31 August, by a majority vote, that Israel had violated the Armistice Agreement by expelling villagers across the demarcation line and decided that the villagers should be allowed to return to their homes. However, when the villagers returned to Wadi Fukin under the supervision of the United Nations observers on September 6, they found most of their houses destroyed and were again compelled by the Israeli Army to return to Jordanian controlled territory.

The United Nations Chairman of the Mixed Commission, Colonel Garrison B. Coverdale (US), pressed for a solution of this issue to be found in the Mixed Armistice Commission, in an amicable and UN spirit. After some hesitation, this procedure was accepted and finally an agreement was reached whereby the Armistice line was changed to give Wadi Fukin to the Jordanian authority who, in turn, agreed to transfer some uninhabited, but fertile territory south of Bethlehem to the Israelis, (essentially a reversal of part of the March 1949 land swap). [9]