Germany’s most powerful film and TV studio, Bavaria Ateliers in Munich, will lose both of its general managers, Gunter Rohrbach and Harald Junge.It was announced yesterday that Rohrbach, responsible for Bavaria’s productions, will not renew his contract for 1994. Junge, in charge of the financial side, will leave the company in March for “personal reasons.” Though Rohrbach, 64, will reach retirement age next year, the announcement came as a surprise. He is respected as one of Germany’s most powerful producers and still has many pet projects in the fire. Junge is 59. Rohrbach claims there were no unusual motives for the decision. “I did this for the last 15 years,” he said, “and now it’s time to do the things I like doing — producing only.” Rohrbach produced “Das Boot” and “Schtonk.” “What form it will take on and whether it will be under the roof of Bavaria are details we have yet to discuss,” Rohrbach said. There are no known candidates to replace Junge and Rohrbach.