Rectification deed

Need not to worry.  This will not have any effect on the agreement.  However,  visit to the office of Sub Registrar where the agreement registered if he can manually correct it by putting his signatures.

Mr. Vimal, i opine that keeping in view the aspect the deeds registered are subject to scrutiny by the Tax authorities, it is in the best interest of both you and the seller - the Sale Deed needs to be corrected by executing a Rectification Deed (as pan number mentioned is part of the deed). Even otherwise, the error discovered in the Sale Deed needs to be rectified even if immediate risk is not mitigated. This may prove to be a hurdle in case you want to sell the property and include the PAN details in that Deed.