Syntax issue with BEGIN ... SET ... END - sql-server-2008

Question

I have written the following stored procedure that uses a Date Dimension table to calculate the next occurrence of a date given a begin date and a frequency.
I am getting some odd syntax errors that seem to occur whenever I have an IF BEGIN SET IF SET END sequence.
In order to help debug, I have gone back in and added unneeded BEGIN and END statements around the one line IF statements.
Am I missing some type of BEGIN - END or IF - ELSE matching rule here? (I've marked the lines that the parser is complaining about with comments.)
CREATE PROCEDURE dbo.GetNextScheduledBusinessDayOccurance
(
#BeginDate DATE,
#Frequency CHAR(1)
)
AS
BEGIN
DECLARE #Date DATETIME,
#currentDate DATE,
#weekOfYear INT,
#dayOfWeek varchar(9),
#weekOfMonth tinyint,
#month varchar(2),
#dayOfQuarter tinyint,
#currentDayOfQuarter tinyint,
#quarterOfNextOccurance tinyint,
#yearOfNextOccurance int;
SET #currentDate = CONVERT(Date, GETDATE())
IF (#BeginDate > #currentDate)-- If it hasn't started yet
BEGIN
SET #Date = (SELECT TOP(1) [DATE] FROM dbo.dim_Date WHERE [DATE] >= #BeginDate AND [Date] > #currentDate AND (IsBusinessDay = 1) ORDER BY [DATE])
END
ELSE
BEGIN
IF #Frequency = 'A' --Annually
BEGIN
SET #Date = (SELECT TOP(1) [DATE] FROM dbo.dim_Date WHERE ([DATE] > #currentDate AND [Month] >= DATEPART(MONTH, #BeginDate) AND [Day] >= DATEPART(DAY, #BeginDate) AND IsBusinessDay = 1) ORDER BY [Date])
END
ELSE IF #Frequency = 'B' --Biweekly
BEGIN
SET #weekOfYear = (SELECT WeekOfYear FROM dbo.dim_Date WHERE [Date] = #BeginDate)
SET #dayOfWeek = (SELECT [DayOfWeek] FROM Dbo.dim_Date WHERE [Date] >= #BeginDate AND IsBusinessDay = 1)
SET #Date = ((SELECT TOP(1) [Date] FROM dbo.dim_Date WHERE ([DATE] > #currentDate AND [WeekOfYear]%2 = #weekOfYear%2 AND [DayOfWeek] = #dayOfWeek AND IsBusinessDay = 1) ORDER BY [Date]))
END
ELSE IF #Frequency = 'D' --Daily
BEGIN
SET #Date = ((SELECT TOP(1) [Date] FROM dbo.dim_Date WHERE ([DATE] > #currentDate AND IsBusinessDay = 1) ORDER BY [Date]))
END
ELSE IF #Frequency = 'E' -- Semi-Monthly (twice each month) (assume the 15th and last day of month)
BEGIN
-- GET the next 15th or last day of month.
SET #Date = (SELECT TOP(1) [Date] FROM dim_Date WHERE [Date] > #currentDate AND (Day = '15' OR (DateAdd(day, -1, DateAdd( month, DateDiff(month , 0,[Date])+1 , 0)) = [Date])) ORDER BY [Date])
IF ((SELECT IsBusinessDay FROM dim_Date WHERE [Date] = #Date) = 0)
BEGIN
SET #Date = ((SELECT TOP(1) [Date] FROM dbo.dim_Date WHERE (([DATE] > #Date) AND IsBusinessDay = 1) ORDER BY [Date])
END --Parser ERROR: Incorrect syntax near the keyword 'END'.
END
ELSE IF #Frequency = 'I' --Bimonthly (Every other month)
BEGIN
SET #Month = (SELECT Month FROM dbo.dim_Date WHERE [Date] = #BeginDate)
SET #Date = (SELECT TOP(1) [Date] FROM dbo.dim_Date WHERE ([Date] > #currentDate AND [Month]%2 = #Month%2 AND [Day] = DATEPART(day, #BeginDate)) ORDER BY [Date])
IF ((SELECT IsBusinessDay FROM dim_Date WHERE [Date] = #Date) = 0)
BEGIN
SET #Date = ((SELECT TOP(1) [Date] FROM dbo.dim_Date WHERE (([DATE] > #Date) AND IsBusinessDay = 1) ORDER BY [Date])
END --Parser ERROR: Incorrect syntax near the keyword 'END'.
END
ELSE IF #Frequency = 'L' --Last Business Day of the Month
BEGIN
SET #Date = (SELECT TOP(1) [Date] FROM dim_Date WHERE [Date] > '2013-03-20 00:00:00.000' AND (DateAdd(day, -1, DateAdd( month, DateDiff(month , 0,[Date])+1 , 0)) = [Date]) ORDER BY [Date])
IF ((SELECT IsBusinessDay FROM dim_Date WHERE [Date] = #Date) = 0)
BEGIN
SET #Date = ((SELECT TOP(1) [Date] FROM dbo.dim_Date WHERE (([DATE] < #Date) AND IsBusinessDay = 1) ORDER BY [Date] DESC))
END
END
ELSE IF #Frequency = 'M' -- Monthly
BEGIN
SET #Date = (SELECT TOP(1) [Date] FROM dim_Date WHERE [Date] > #currentDate AND (Day > DATEPART(day, #BeginDate)) ORDER BY [Date])
IF ((SELECT IsBusinessDay FROM dim_Date WHERE [Date] = #Date) = 0)
BEGIN
SET #Date = ((SELECT TOP(1) [Date] FROM dbo.dim_Date WHERE (([DATE] > #Date) AND IsBusinessDay = 1) ORDER BY [Date])
END--Parser ERROR: Incorrect syntax near the keyword 'END'.
END
ELSE
IF #Frequency = 'Q' --Quarterly
BEGIN
SET #dayOfQuarter = (Select DayOfQuarter FROM dim_Date WHERE [DATE] = #BeginDate)
SET #currentDayOfQuarter = (Select DayOfQuarter FROM dim_Date WHERE [DATE] = #currentDate)
SET #quarterOfNextOccurance = (SELECT [Quarter] FROM dbo.dim_Date WHERE [Date] = #currentDate)
SET #yearOfNextOccurance = (SELECT [Year] FROM dbo.dim_Date WHERE [Date] = #currentDate)
--SELECT #dayOfQuarter DOQ, #currentDayOfQuarter curDOQ, #quarterOfNextOccurance QofNext, #yearOfNextOccurance YofNext
IF (#currentDayOfQuarter >= #dayOfQuarter)
SET #quarterOfNextOccurance = #quarterOfNextOccurance + 1
SET #Date = '1900-01-01'
WHILE (#Date < #currentDate) --Loop through this just in case we're close to the end of the Quarter, and there's no more business days left
BEGIN
IF (#quarterOfNextOccurance > 4)
BEGIN
SET #quarterOfNextOccurance = #quarterOfNextOccurance%4
SET #yearOfNextOccurance = #yearOfNextOccurance + 1
END
--SELECT #quarterOfNextOccurance QofNext, #yearOfNextOccurance YofNext
--CREATE a temp table with all of the business dates from the target quarter in decending order.
SELECT * INTO ##temp FROM (SELECT TOP(92) [Date], MAX(DayOfQuarter) as DOQ FROM dim_Date WHERE (YEAR = #yearOfNextOccurance AND Quarter = #quarterOfNextOccurance AND IsBusinessDay = 1) Group By Date ORDER BY Date DESC) as foo
SET #Date = (SELECT TOP(1) DATE from ##temp WHERE DOQ <= #dayOfQuarter)
SET #quarterOfNextOccurance = #quarterOfNextOccurance + 1 -- Go ahead and incriment this just in case we start the WHILE over.
--SELECT * FROM ##temp
BEGIN TRY DROP TABLE ##temp END TRY BEGIN CATCH END CATCH
END
END
ELSE
IF #Frequency = 'S' --Semi-annually
BEGIN
SET #Date = #BeginDate
WHILE (#Date < #currentDate)
BEGIN
SET #Date = (SELECT [Date] FROM dbo.dim_Date WHERE [Date] = DATEADD(MONTH, 6, #Date))
END
IF ((SELECT IsBusinessDay FROM dim_Date WHERE [Date] = #Date) = 0)
BEGIN
SET #Date = ((SELECT TOP(1) [Date] FROM dbo.dim_Date WHERE (([DATE] > #Date) AND IsBusinessDay = 1) ORDER BY [Date])
END--Parser ERROR: Incorrect syntax near the keyword 'END'.
END
ELSE
IF #Frequency = 'W' --Weekly
BEGIN
SET #dayOfWeek = (SELECT [DayOfWeek] FROM dbo.dim_Date WHERE [Date] = #BeginDate)
SET #Date = (SELECT TOP(1) [Date] FROM Dbo.dim_Date WHERE DayOfWeek = #dayOfWeek AND [DATE] < #currentDate ORDER BY [DATE] DESC)
--SELECT #Date DATE, #BeginDate BeginDate
WHILE ((#Date < #currentDate) OR (#Date < #BeginDate))
BEGIN
SET #Date = (SELECT [Date] FROM dbo.dim_Date WHERE [Date] = DATEADD(Week, 1, #Date))
--SELECT #Date DateInWHile
END
IF ((SELECT IsBusinessDay FROM dim_Date WHERE [Date] = #Date) = 0)
SET #Date = (SELECT TOP(1) [Date] FROM dbo.dim_Date WHERE (([DATE] > #Date) AND IsBusinessDay = 1) ORDER BY [Date])
--SELECT #Date
END
ELSE
SET #Date = NULL
END
RETURN #Date
END
GO

Answer 1

You're missing a closing ):
BEGIN
SET #Date = ((
SELECT TOP(1) [Date]
FROM dbo.dim_Date
WHERE (([DATE] > #Date) AND IsBusinessDay = 1)
ORDER BY [Date]) ) -- Paren added here...
END --Parser ERROR: Incorrect syntax near the keyword 'END'.