He said Minister of State for Food K V Thomas had written to him on September 5, 2013 saying a proviso had been added in the Act for protecting the differential in cases where states were receiving lesser foodgrains under the Act than the current allocation.
Quoting from Thomas' letter, Karunanidhi said "tide-over allocation" would be at the issue price as applicable to Above Poverty Line (APL) category under Targeted Public Distribution System (TPDS)--Rs 6.10 per kg for wheat and Rs 8.30 kg for rice.
The Minister was answerable to an Assurances Committee over assurances made in Parliament, he added.
The 90-year-old leader said any assurances made by Ministers in Parliament or Assembly have to be implemented and wondered how it was fair for the Chief Minister to announce that she will not accept this.
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Jayalalithaa had on Saturday rubbished Karunanidhi's claim that Tamil Nadu would continue to get rice for APL category at Rs 8.30, and alleged that UPA's idea was to provide rice at old price "for a few months for an eyewash" and then change it.
The DMK chief added that the Act could be amended in future based on experiences and wondered why his party was being criticised for supporting the bill.
Jayalalithaa has been insisting that DMK had betrayed the people of Tamil Nadu by supporting the UPA initiative which she says is disadvantageous to her state.