BP is having difficulties selling its stake in Argentine business Pan American Energy, according to reports in The Sunday Times.If the deal does not go through, it could place pressure on BP chief executive Bob Dudley, who began the process in order to rebuild the company's finances, the paper said.The $7.1bn deal was announced on November 28, ahead of a twelve-month period to finalise the details and obtain regulatory authorisations. However, sources have told the British daily that the chance of the deal getting done is "at best 50-50."BP remains optimistic and affirms that it is only waiting for Argentine competition approvals. The buyer of this stake of Pan American Energy would be Bridas Corp. Negotiations could go beyond the twelve months initially planned if both parties agree.Sources close to Argentine's anti-trust agency, the CNDC, told Dow Jones that they continue to study the case No final deadline has been set.Pan American holds its main assets in Argentina, where it is the second largest oil and gas producer. The company also has assets in the transportation of these energues, its storage, gas distribution, and eletricity generation. Bridas Corp is a joint venture between the international divison of China National Offshore Oil and Bridas Energy, owned by the Argentine Bulgheroni family.S.B.