Correction of 26QB and rights of ITO(TDS) to scrutiny.

My clients while paying TDS on immovable property erroneously entered agreement value of purchase of property instead of respective share of ownership. Case is assigned to ITO(TDS) for correction in amount. Now the officer is asking for previous years returns, proof of ownership ratio (which is never mentioned in the agreement) etc. My question is whether ITO(TDS) has rights to scrutinize the case this way? What are the rights to ITO(TDS)?