rotopaint stupid question

i know sound really stupid, but im importing a footage with alpha and i want simple to mask a part couse will not be visible, i apply a rotopaint, and magically doesnt go away!! ive try putting aoutput to alpha and premultiply to everything but i can cant mask out that part, its allways or visible or maks everything with white…
someone have a explanation? i can understand that roto its not considering my alpha but apply one after its applied!!
thanks for any help
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