Here are some relevant sections from the Book of Church Order about teaching elders serving "out of bounds".

8-7. A Presbytery may, at its discretion, approve the call of a teaching elder to work with an organization outside the jurisdiction of the Presbyterian Church in America, provided that he be engaged in preaching and teaching the Word, that the Presbytery be assured he will have full freedom to maintain and teach the doctrine of our Church, and that he report at least annually on his work. As far as possible, such a teaching elder shall be a member of the Presbytery within whose bounds he labors. (See BCO 20-1.) 13-2. A minister shall be required to hold his membership in the Presbytery within whose geographical bounds he resides, unless there are reasons which are satisfactory to his Presbytery why he should not do so. When a minister labors outside the geographical bounds of, or in a work not under the jurisdiction of his Presbytery, at home or abroad, it shall be only with the full concurrence of and under circumstances agreeable to his Presbytery, and to the Presbytery within whose geographical bounds he labors, if one exists. When a minister shall continue on the rolls of his Presbytery without a call to a particular work for a prolonged period, not exceeding three years, the procedure as set forth in BCO 34-10 shall be followed. A minister without call shall make or file a report to his Presbytery at least once each year.

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