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A：「この本 借りてくよ。」
B：「あっ 学校の本は持ち出し禁止です。」
A：「じゃあ 黙っといてよ。」
B：「規則ですから そういうわけには。」
In this exchange, when B says「そういうわけには。」, what does そういう refer to? Is she saying that she cannot keep quiet about A borrowing books, or more simply that A cannot borrow books? Is the scope of that phrase just the line immediately before or is it the situation as a whole?
Also, just so I'm clear, わけには is short for わけにはいかない, yes?
I think B is saying that Because it's the rules, they can't do it like that (stay silent). Although I mostly base it on examples. And yes, in this case わけには is definitelly short from of わけにはいかない and そういう refers to the proposed "solution".
A very frequent usage of わけにはいかない is for something you can't do for moral reasons.
So I'd translate the last question as : It's the rule, so I'd never do such a thing/what you say (and stay silent about you taking out that book).
