Need max date record from CMOD by Plant, Material & Movement type Condition

Dear Experts,

In Query I have Material , Plant, Movement type and Posting Date fields.

Source of the below Query is DSO.

My Requirement is to get the Records Max Posting Date based on Material, Plant Combination only ONE Record Feacting (Unique).

(Material, Plant combination and check the movement if 601 & 602 take the record which is max Posting Date , Else check the the Movement Type 201 & 202 take the record which is max Posting Date, Else check the the Movement Type 101 & 102 take the record which is max Posting Date).

Ex:  In DSO.

Material      Plant     Movement Type     Posting Date

10001         1100      601                     10.12.2013

10001         1100      602                     23.12.2013

10001         1100     101                      12.10.2013

10002        1100      101                     01.12.2012

10002        1100      102                     22.12.2012

10002        1100      201                     11.10.2012

As Per my Requirement I need

Below Two Records wants to get after executing the CMOD Code.

I Started writing the code with Posting Date with variable CHAR and Processing Type CUSTOMER EXIT.

WHEN 'ZVAR_LMD'.

data: it_DMR type table of /BIC/AZDSO_DMR00.

Select * from /BIC/AZDSO_DMR00 into table it_dmr

I Strucked here.

Please help me on ABAP CODE.

Thanks & regards,

Srinu.Rapolu