I am new at this and posted this question somewhere but now can't find it. So, I'm asking again. We were playing doubles last night and a ball rolled from an adjacent court along the back fence opposite my partner and me. The ball posed no danger and our play was not hindered in any way so we did not call a let but continued to play the point. A player from the adjacent court called a let because of this ball (it was still by the fence not on the court). Our opponents then ceased play and claimed a let. Is is acceptable for persons not on your court to call a let? I checked my Friend at Court book and the Code and can't find the answer to this question. Any help? Thanks.