Function Module does not fetch value

Question

Hi All,
I am using the fm RV_PRICE_PRINT_HEAD to fetch condition records. When I run this fm in SE37 for a particular document(vbeln) number, the values are fetched correctly into the internal tables TKOMV and TKOMVD.
The same fm does not fetch values when I run for second time for the same document(vbeln). This means :
1) I will go to SE37, type RV_PRICE_PRINT_HEAD, supply the export parameters in COMM_HEAD_I, execute it and obtain the condition records (Till this time absolutely fine)
2) Now, press Back (F3), Let the export parameters in "COMM_HEAD_I" will remain same. Just press Execute (F8). Then condition values are not fetched.
Could any body help in this regard...
Thanks
Thimmappa Hegde

Answer 1

Hi
   I have given you the other alternative bcoz there is a limitation while calling this FM: RV_PRICE_PRINT_HEAD.
If you see the comments and code of Include: LV61AA11, you can understand the problem.
<b>* mechanism to controll which conditions are already part of table TKOMV
Every time a pricing result is read from database the key is put into
TABGL. Also TABGL is updated if we've lines in TKOMV assigned to a
special key but entry in TABGL (case 2).
Originally TABGL was established to handle following pathological
case: condition successfully read from DB -> entry in TABGL. Then all
read conditions where deleted during processing (e.g. manually
deletion etc.). If we run into this routine again no records should
be redetermined from DB...</b>
  read table tabgl with table key knumv = komk-knumv
       transporting no fields.
Case 1:
conditions have been already read because there is a fitting entry in
TABGL. Exit immediately if caller doesn't want to force DB access.
  if sy-subrc eq 0. ---><b> First time SY-SUBRC NE 0 so no problem</b>   
     if generell_lesen ne 'X'. <b>--> Later runs SY-SUBRC  eq 0 and generell_lesen value is SPACE</b>.
        exit.
    endif.
  else.
  Hope this clarifies your doubt now.
Kind Regards
Eswar