Variable required for 0DOC_DATE, same as the SAP exit variable 0P_KEYDT

Question

Hi Gurus,
I am currently trying to create a query based upon the InfoProvider -  FIAP: Line Item (0FIAP_C03).
For the Characteristic Net Due Date (0NETDUEDATE) there is a SAP exit variable called Key Due Date (0P_KEYDT).
I need to replicate this variable for 0DOC_DATE, which is what I need to use in this query.
I do not have any knowledge of ABAP therefore could you please advise;
1) Whether this variable can be replicated for 0DOC_DATE so that it defaults to system date - 1 day
2) What steps I need to take to create this variable
3) What is the exact ABAP code that I will need to do this.
If there is a variable that already exists for 0DOC_DATE that acts in the same way as 0P_KEYDT then please let me know.
Thanks
Nate

Answer 1

Hello,
1&3) goto CMOD - create e.g. ZBWVARS. Add RSR00001enhancement. Modify ZXRSRU01 include.
You need developer key to do that.
CASE i_vnam.
WHEN 'ZDOC_DATE,'.
    IF i_step EQ '2'.
      CLEAR l_s_range.
      l_s_range-sign = 'I'.
      l_s_range-opt = 'EQ'.
      l_s_range-low = sy-datum - 1.
      APPEND l_s_range TO e_t_range.
    ENDIF.
ENDCASE.
2) In Query Designer create customer-exit variable ZDOC_DATE.
BR
Ondrej