FRANKFURT--A spat between the Austrian government and BayernLB escalated Thursday after the German lender said the Alpine country should repay 2.4 billion euros ($2.99 billion) in outstanding loans to its former Austrian unit.

A spokesman for BayernLB said the EUR2.4 billion is owed because the Austrian government had promised to repay the credit line after it nationalized Hypo Alpe Adria. "Austria guaranteed it would pay back [EUR2.4 billion] in credit lines," the spokesman for BayernLB said.

He added that the bank has set a two-week deadline for repayment.

The Austrian Finance Ministry and Hypo Alpe Adria, now renamed Heta Asset Resolution, weren't immediately available for comment.

Hypo Alpe Adria ran into deep financial difficulty in 2006 after overextending itself in the Balkans, and it was nationalized by the Austrian government in 2009. To help stabilize Hypo Alpe Adria, BayernLB maintained several billion euros in credit lines to the unit, which were guaranteed by Austria.

Earlier this year, BayernLB filed a lawsuit in Austria's constitutional court against the Austrian government for implementing a law that forced Hypo Alpe Adria's creditors to take losses on more than EUR1.5 billion in loans. The law also allowed Hypo Alpe Adria to defer repayment by five more years of another EUR1.5 billion in loans to BayernLB that were due in 2012.

Friction between Austria and BayernLB came to a head in late October, when Austria said it aimed to sell Hypo Alpe Adria's southeastern European network, SEE, to private-equity firm Advent International and the European Bank for Reconstruction and Development.

The Austrian government had expected BayernLB to sign off on the sale by the end of this month. Instead, BayernLB, which is still trying to recoup its loans, has insisted on reviewing the details. BayernLB still has a say in significant restructuring measures at its former unit, and its veto could derail the deal.

On Thursday, BayernLB said it couldn't comment on the sale of SEE.

Write to Eyk Henning at eyk.henning@wsj.com

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