The tax paid on procuring certain services and goods is not eligible for input credit. Services such as renting of motor cab, supply of tour operator services and items that are used in manufacturing of exempt goods fall under this ineligible for input credit category. You can not claim credit for tax paid for these items.
In TallyPrime you can set goods or services as ineligible for input credit by enabling the option Is ineligible for input credit to Yes in the GST Details screen of the item master or purchase ledger. This option can be activated by enabling Set ineligible input credit to Yes under F12 (Configure).