Case When IN IDT

Hi Experts,

I have Plant, Material, Movement type and Date.

My requirement is I want the MAX date in Material and Plant combination, with Movement type condition

First I need MAX date in Material and Plant combination, where Movement type is 602 , if 602 is null then 601, if 601 is null then 102, if 102 is null then 101 if 101 also is null then other Movement types.

For this I used below code in derived table in IDT but I am not able to get the correct results:

SELECT

DISTINCT

Table__1."0PLANT",

Table__1."0MATERIAL",

Max(Table__1."0PSTNG_DATE") as Last_Sales_Date

FROM

  "NM1"."PUBLIC"."IZDSO_DMR"  Table__1

  Where

      CASE 

      WHEN (Table__1."0MOVETYPE"=602) THEN (Table__1."0MOVETYPE"=602)

  WHEN (Table__1."0MOVETYPE"=602) IS NULL THEN (Table__1."0MOVETYPE"=601)

            ELSE

   (Table__1."0MOVETYPE"=601) END

   Group By

  Table__1."0MATERIAL",

  Table__1."0PLANT"

I tried only for 602, 601 Movement types only

Please help me to get the correct result

Thanks,

G Sampath Kumar