A TCAS RA is not necessarily an airprox. As someone has already said, once the correct separation is maintained there is no problem. (TCAS looks at rates of closure so if somone is climbing from directly below you at, for example, 3,500fpm to level out 1000ft below you may well get a climb RA, but provided they level off 1000ft below then there has been no loss of separation).
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