Problem with primatte !

HI
I have a shot with bad green background .I add Rotopaint node to draw mask around my actor
To make it easier for keyer . After that I add premultiply node to multiply RGB with Alph channel
And everything look ok. But after I add primatte node for keying ,primatte ignore my mask .
I know I can use crop knob in primatte node, but it’s so linear and you should crop with just four lines.
How should force primatte to don’t look outside of the mask.

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