The Nano factory and its ancillary units were being built on about 1,000 acres of land. About 400 acres, earmarked for ancillary units, is under dispute.
Tata Motors says separating the ancillary units from the main plant would upset the project's cost calculations, and any alteration in the original arrangement was unacceptable.
"We have clearly mentioned our stand in a letter to the government, there is nothing more to add at the moment," a Tata Motors spokeswoman said on Wednesday.
Trouble began after the government acquired farmland for the factory last year. The government offered compensation which some farmers rejected, demanding that at least 400 acres be returned.
The government says it is in favour of a land-based solution for farmers but against disturbing the Tata Motors plant site.
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