FRANKFURT (Reuters) – German business software firm SAP reported a 6 percent gain in fourth-quarter operating profit but saw growth limited by adverse currency effects. Fourth-quarter operating profit, excluding special items, came to 2.09 billion euros ($2.84 billion), it said on Friday. Profit would have grown by 14 percent at constant currencies, it said. The company, which is due to publish full quarterly results on January 21, had warned in October that exchange rate fluctuations could shave about 7 percentage points off operating profit growth. …