Case tatement not working within a cursor

Question

I am having a problem getting the case statement to work within a cursor in a store procedure in our 2008 r2 environment. Below is the cursor that I'm referring too. Any suggestions would be greatly appreciated.
SET NOCOUNT ON;
DECLARE @part_id as int, @WAREHOUSE_ID AS varchar(80), @SAFETY_STOCK_QTY AS int;
DECLARE parts_cursor CURSOR FOR
select part_id ,WAREHOUSE_ID,  coalesce(SAFETY_STOCK_QTY,0) from PART_WAREHOUSE where Part_ID in (SELECT distinct  #FLINES03.Part from #FLINES03)
OPEN parts_cursor
FETCH NEXT FROM parts_cursor
INTO @part_id, @WAREHOUSE_ID, @SAFETY_STOCK_QTY
WHILE @@FETCH_STATUS = 0
BEGIN
  CASE @WAREHOUSE_ID
    WHEN 'AAA' THEN UPDATE #FLINES03 SET WHS1_SS_QTY = @SAFETY_STOCK_QTY WHERE #FLINES03.PART = @part_id AND #FLINES03.WHS1 = @WAREHOUSE_ID
    WHEN 'BBB'THEN UPDATE #FLINES03 SET WHS2_SS_QTY = @SAFETY_STOCK_QTY WHERE #FLINES03.PART = @part_id AND #FLINES03.WHS2 = @WAREHOUSE_ID
    WHEN 'CCC'      THEN UPDATE #FLINES03 SET WHS3_SS_QTY = @SAFETY_STOCK_QTY WHERE #FLINES03.PART = @part_id AND #FLINES03.WHS3 = @WAREHOUSE_ID 
  END   
  FETCH NEXT FROM parts_cursor INTO @part_id, @WAREHOUSE_ID, @SAFETY_STOCK_QTY
END
CLOSE parts_cursor
DEALLOCATE parts_cursor

Answer 1

CASE is an expression, not a statement. It means you can not execute code. You need to change your code to IF statements, e.g.
IF @WAREHOUSE_ID = 'AAA'
    UPDATE ....
IF 
    UPDATE ...
Also, what is the purpose of using cursor? Can you provide the whole picture of what you're trying to achieve?
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