How to check if a user fills a header text in billing invoice

Question

Hi everybody and thanks in advance.
My consultant wants to oblige all users to fill a header text when they create the billing invoice (vf01).
I was looking for several user exits when I can manage this requisite.
My problem is that when the user creates the invoice and push save button, I try to look for in the table STXH if the user created the header text. But I have not found anything, because the invoice has not created yet.
Only when the billing invoice has saved, the header text is stored in the table STXH.
I has been trying to find a structure wich contains the header data like xvbrk contains the data about type of invoice, etc.
I have studied this user exits:
userexit_number_range (module pool saplv60A, program rv60afzz)
userexit_account_prep_komkcv (same module)
userexit_account_prep_kompcv (same module)
userexit_fill_vbrk_vbrp (same module)
v60A0001 (Customer functions in the billing document).
My question is: In which structure is the header text of billing invoice manage before push the save button?
If I knew where it is, I could manage the data and check if the user filled the header text.
Thank you very much, and sorry for my pour English.

Answer 1

David,
Place this code into USEREXIT_NUMBER_RANGE:
DATA: CATALOG LIKE TCATALOG OCCURS 0 WITH HEADER LINE,
      MEMORY_ID(30).
data: c_MEMORY_ID(30) VALUE 'SAPLSTXD'.
DATA l_head type THEAD.
DATA wa_head type THEAD.
data: l_lines type table of TLine.
data: l_line type TLine.
DATA l_CATALOG type TCATALOG.
IMPORT CATALOG FROM MEMORY ID 'SAPLSTXD'.
loop at catalog into l_catalog.
   if  l_catalog-IS_REFTEXT is initial
   and l_catalog-keep is initial.
     concatenate c_memory_id l_catalog-id into memory_id.
     import thead to l_head
            tline to l_lines
       from memory id memory_id.
     loop at l_lines into l_line.
       message i000(zz) with l_line-TDLINE.
     endloop.
   endif.
endloop.
It will expose the text entered into the text ids in a message box (for now).  You will want to replace the MESSAGE statement with your own logic.
You may also need to change the message numver/class from ZZ - as seen here "message i000(zz) with l_line-TDLINE."  with an appropriate message on your system.
DON'T forget those points.