Fraud under indian contract act

The terms and conditions of the contract has to be explicit and clear. Once A & B agreed and executed an agreement it is binding.

By the way what is your problem / dispute / concern / locus standi to this hypothetical academic exercise, be specific, precise and clear instead of posting moot court topic ?

I like to post short queries so that they are easy to answer rather than describing all facts in detail. Take a cue from Advocate Kalaiselvan. See how he answers with precision.

This is a standard Agreement term which reads as This is the entire agreement and there are no other written or verbal agreements or representations"

 and there is another part included in this standrad clasue that , This contract supersedes all prior agreement and understandings, whether oral or written, in connection therewith etc,.

You need to understand the purpose of this clasue which is intended to limit the Agreement as final document for future references.  Now if the Party in the agreement has enterd in an agreement with anyother party that won't effect or casue this clasue to be implemented,

If there is clear bar for either of Parties  to contract further with  any other Party then only the Agreement will be deemed voilated. Just Entire Agreement clasue does not amounts to breach for the reason you stated.

You can read below article for full undertsanding

https://www.reedsmith.com/en/perspectives/2015/12/entire-agreement-clauses--do-they-work-or-not

If the conditions of the contract or agreement are intended to be executed with fraudulent notion behind the contract and if either of the party commits breach or violates the contract condition then the contract itself will be void, the aggrieved party can sue the other party for the losses or damages suffered based on the documentary evidences to support the claim.