CREATE FUNCTION ImmediateTask (@idOpportunity uniqueidentifier)
RETURNS varchar( 20 )
 AS  
BEGIN 
declare @retValue varchar( 20 ),
	@currentdate smalldatetime
select @currentdate=GETDATE()
select  top  1  @retValue=convert(varchar( 20 ),DateTaskRun, 114 ) from task where DateDiff(minute,DateTaskRun,@currentdate)=(
	select min(DateDiff(minute,DateTaskRun,@currentdate)) from task Where OpportunityId=@idOpportunity)
set @retValue=''
return @retValue 
end

Server: Msg  208 , Level  16 , State  1 , Procedure ImmediateTask, Line  14 
Invalid object name 'dbo.GETDATE'.