Stemp duty valution

I PURCHASED THE PROPERTY FORM ONE PARTY SAY MR X RS 50 LACS. HOWEVER MR X MAKE SALE DEED OF RS 1 CRORE WHEN HE PURCHASED. STEMP DUTY VALUTION OF THIS PROPERTY RS 45 LAKH (JANTRI VALUE). WHETHER I CAN PURCHASED THIS PROPERTY...??? BECAUSE MY X SUFFER HIGH LOSS SAY RS 50 LAKHS. ANY QUERY RAISED BY DEPARTMENT IN FUTURE FOR THE PURCHASED OF THIS PROPERTY....?????