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Why this line showing up on both faces?

I'm not sure why those lines show up. Maybe a software bug in CATIA?

Using Chamfer to taper the front and rear faces is an interesting technique. Chamfers are normally used to eliminate a sharp corner, like a fillet. They normally are short and don't extend the entire length of a face, like you've done. But there's nothing wrong with using a Chamfer for the tapered faces. Maybe it was confused with the slot in the middle?

You didn't show the tree diagram, so I have no idea what features were used to model what you have so far. And there are many ways to model a part like this.

But I suggest replacing the Chamfer with a Sketch and use a Pocket to cut-off the faces, like the picture below.

KINSTON4.JPG
 
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Maybe it was confused with the slot in the middle?

YES. I applied edge chamfer before applying slot(pocket). Then I didn't get that line.
 

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