BERLIN, Jan 14 (Reuters) - Business software group SAP forecast flat revenue and a decline in operating profit in 2021, as it released preliminary annual results that came at the high end of guidance slashed last autumn.

Walldorf-based SAP said it expected adjusted revenue, at constant currency, to be flat to up 2% this year, while it saw adjusted operating profit falling by 1%-6%. (Reporting by Douglas Busvine Editing by Chris Reese)