Stored Procedure And A New Database Field

I am very new to stored procedures and fairly new to SQL in general. I have a stored procedure that looks like this:


CREATE PROCEDURE sp_UpdateProductsTable
@prodName varchar(50),
@prodManufacturer varchar(50),
@prodShortDescrip text,
@prodLongDescrip text,
@prodCatId int,
@prodPrice varchar(6),
@prodSortOrder int,
@prodActive int,
@prodId int
AS
if( @prodId <> 0 )
begin
update Products set
Name = @prodName,
Manufacturer = @prodManufacturer,
ShortDescription = @prodShortDescrip,
LongDescription = @prodLongDescrip,
CategoryID = @prodCatId,
Price = @prodPrice,
SortOrder = @prodSortOrder,
Active = @prodActive
where ID = @prodId;

select ID as prodId from Products where ID = @prodId

end
if( @prodId = 0 )
begin
insert into Products ( Name, Manufacturer, ShortDescription, LongDescription, Price, CategoryID, SortOrder, Active )
values( @prodName, @prodManufacturer, @prodShortDescrip, @prodLongDescrip, @prodPrice, @prodCatId, @prodSortOrder, @prodActive );

SELECT SCOPE_IDENTITY() AS prodId
end

GO



I have recently added two new fields to the database that I need the stored procedure to act upon, but adding them into the above code does not work. I read somewhere that this would happen with new fields, but I do not know how to fix this issue. Could someone point me in the right direction and help me out? I also have some other tables and SP's that I need to update, but its the same issue, I think so fixing this one should help me out across the board.

Thanks in advance for your help.