UNIQUE Problem in pulling DATA from DATA base table to internal table

Question

Dear Experts,
I am new to ABAP. I have a very basic question but looks a quite puzzling one to me. Hemnce I am posting it here.
I am facing an unique problem in pulling data from database table and populating that data into internal table for further use.
The data in the database table "Zlt_mita" with fields M1 (Employee Name, Type: Char20) and M2 (Employee Code, Type Char7) are:
Plz refer the screenshot in the attached file:
My Code:
1) When I try to pull data from Dbase table by taking M2 as parameter.
     This code is succcessful and I am able to populate data in internal table it_dat.
TYPES: Begin Of ty_DAT,
                 M1   TYPE  Zlt_mita-M1,
                 M2   TYPE  ZLT_mita-M2,
             END  OF  ty_DAT.
DATA: it_dat        TYPE STANDARD TABLE OF ty_dat with header line,
          wa_dat      TYPE   ty_dat.
PARAMETERS: p_mitar    TYPE  Zlt_Mita-M2.
SELECT           M1
                       M2
        FROM     ZLt_mita
        INTO       TABLE it_dat
        Where     M2 = p_mitar.
Loop at it_dat into wa_dat.
   WRITE:/2 wa_dat-M1,
              10 wa_dat-M2.
ENDLOOP.
2) When I try to pull data from Dbase table by taking M1 as parameter.
     This code is NOT succcessful and I am NOT able to populate data in internal table it_dat.
TYPES: Begin Of ty_DAT,
                 M1   TYPE  Zlt_mita-M1,
                 M2   TYPE  ZLT_mita-M2,
             END  OF  ty_DAT.
DATA: it_dat        TYPE STANDARD TABLE OF ty_dat with header line,
           wa_dat      TYPE   ty_dat.
PARAMETERS:    P_Mita    TYPE   ZLT_Mita-M1.
SELECT           M1
                       M2
        FROM     ZLt_mita
        INTO       TABLE it_dat
        Where     M1 = P_Mita.
Loop at it_dat into wa_dat.
   WRITE:/2 wa_dat-M1,
             10 wa_dat-M2.
ENDLOOP.
Why is this happening when both M1 and M2 are Type Character fields.
Looking forward for your replies.
Regards
Chandan Kumar

Answer 1

Hi Chandan ,
Database fetch is case sensitive ,So u need to give exact format in where condition.
Make your parameter and database in same case so that you need not worry about case sensitivity .
Check the lowecase check box in the domain .
Then declare your parameter 
PARAMETERS:
P_Mita
TYPE   ZLT_Mita-M1 LOWER CASE . 
You can do the vice versa also by unchecking lowercase and giving Upper case instead of lower in parameter declartion .
Regards ,
Juneed Manha