The problem is that people think that lying in court is an acceptable fact. "He did it also" is the normal excuse. The courts too are lenient and such affidavits have been discussed in open court as if it were the normal thing to do.
A false affidavit is a fraud on the court, no less. Forget perjury, the offence is a direct assualt on the judicial system. Get the facts, make an air tight case and ensure that the court acts on it. An FIR should be filed. It is a criminal offence, even if it is civil matter court.
Another aspect is that if there is a fraud on the court, the person so perpetrating the fraud will be barred from all legal proceedings in that matter and all collateral matters. In other words, he cannot seek relief. We are acting on such cases in the Hon. High Court of Bombay. One has to come to court with clean hands.
Bapoo M. Malcolm