Yu-Mordovia, another former Yukos subsidiary, filed the lawsuit Wednesday against Rosneft for 728.5 million rubles.
The lawsuit is based on Yuganskneftegaz's old promissory notes, a source close to Prana said, the paper reported. Since the payback period had passed, the only way to get the money back was legal action, the source said.
Rosneft and Yu-Mordovia were not available for comment.
In a May 2007 bidding war with Rosneft, Prana bid up the price for the building, nearly quadrupling the cost.
A month later, Prana sold the majority of its stakes to Rosneft.
"This is a technical issue," Alfa Bank oil and gas analyst Konstantin Batunin said of the tiff over the $30 million. "If it had to do with a bigger issue, it would be discussed behind closed doors."
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