Can owner question the jurisdiction relying on document not in plaint?

If a suit property is undervalued, the Plaintiff is required to correct the value and pay the deficit court fee. If such re-valuation ousts the pecuniary jurisdiction of the Court in which the suit is filed originally, the plaint has to be returned for presentation in the court having pecuniary jurisdiction. 

If the valuation is not corrected and deficit court fee is not paid even after direction of court, only then the Court can reject the plaint under Order VII Rule 11 (b). 

However in the set of facts that you have provided, the proper valuation of the suit property shall oust the jurisdiction of the Court in which the matter is currently filed, therefore the new owner can move an application under O.7 R.11 (b) for the rejection of the plaint on the grounds of exceeding the pecuniary jurisdiction of the Court. The plaint shall be returned with a direction to file it before the competent court.

Yes, he may reply on the document not disclosed in the Plaint because the ex-owner has relied on the sale deed dated 1993 to determine the value of the suit property. The new Owner can present documents which can help the Court determine the real value of the property and in this case it is an agreement to sell executed by the plaintiff himself.

In the case of Mannu Das v. Kisho Das, AIR 1983 Pat 272, it was held that in case the valuation of the suit property is arbitrary and unreasonable, the Court can interfere Under O. 7 R. 11 of the CPC. In the case where the plaintiff relies upon a sale deed executed in 1993 to value the property, the same cannot be said to be reasonable.