While the Gujarat government said the benchmark was based on Planning Commission criteria, the Centre disputed this.
"If the implication is that anyone who has an income of Rs 11 or 19 is above the poverty line, (it) has to be rejected," Chidambaram told reporters here.
He added that "our case has always been that these benchmarks are for deciding who should be the beneficiary (and) who should not be a beneficiary of a particular programme. These benchmarks are not indicators of poverty."
Recalling how the BJP had made a hue and cry over the Planning Commission's poverty line of Rs 32 a day based on daily consumption, he said, "I can't imagine how they can put out a number like 11 and 19. I have to check whether these numbers are derived or derivable from the Planning Commission's numbers."
The Gujarat government insisted that the data is based on criteria that the Centre has not modified in the past 10 years. Gujarat gives rations to an additional 11 lakh families through its own resources, a state government statement had said.
Accusing Modi of levelling false allegations, Minister of State for Planning Rajeev Shukla said, "He has not updated (his poverty) figures and was still in Vajpayee government mindset. Now the figure is Rs 31.06 for rural areas and Rs 38.40 for urban areas (for Gujarat)."
Elaborating, Shukla said that after the Lakdawala Committee, there had been the Tendulkar Committee and after that, the matter is now being examined by the Rangarajan Committee.
The Rs 10.80 a day figures, Shukla said, are no longer relevant as they refer to the NDA regime, when poverty figures were calculated based on the methodology of the Lakdawala Committee.