Stored Proc Help Needed

 I have a created a stored procedure which gets the values from the 'Orders' table. The procedure goes like this:


CREATE PROC DataSource_GetDetails@OrderId int

ASDECLARE @ColNumber int

SELECT @ColNumber = (Select Coalesce(Col_length('Orders','BranchId'),0))

IF(@ColNumber >0)

BEGIN

SELECT Orders.OrderID,

Orders.Buyer,Orders.Seller

Orders.BranchIDFROM Orders

WHERE Orders.OrderID = @OrderId

END

ELSE

BEGIN

SELECT Orders.OrderID,

Orders.Buyer,Orders.Seller

FROM Orders

WHERE Orders.OrderID = @OrderId

END
 Here  i check whether a column named 'BranchId' exists in the 'Orders' table in a particular database and based on the result 2 different select statements are returned. The problem is, if i run this stored proc in the database which does not have a column 'BranchId' it throws me an errorMsg 207, Level 16, State 3, Line 1

Invalid column name 'BranchID'.
How do i tackle this in the stored proc?
Thanks