Code of Conduct: "Responsibility to maintain and satisfy the scope and objectives"?

 Is this an outdated version of the code of conducts?  I'm taking a PMStudy exam and this was the answer to the following question:

"When the contract is halfway through, the buyer requests you to incorporate some additional requirements which were not defined in the original contract. Since satisfying the buyer is important, you go ahead and incorporate those requirements as part of the project. According to PMI, this action is a violation of which aspect of Code of Ethics and Professional Conduct?"

If so, where in the Code is it?  Seems kind of out of place with all the other lofty codes.

Thanks!  I'm rushing so thanks in advance for quick responses!!!