Substitute item line text (BSEG-SGTXT)

Question

Dear all,
I have some questions here. For example, in tcode FB60, we enter the vendor code, invoice date, amount, tax, etc. When click on simulate, there will be another line item for Tax Input(if we select the tax). One of my requirement is, if user enter any text at the basic data tab (SGTXT), i would like to copy the text (BSEG-SGTXT) to the TAX INPUT text (BSEG-SGTXT), means different line item. When i click save for park documents, the tax input text needs to be saved too. So when i view in tcode FB03, the Tax input text will also have the same value as the vendor line item text. As well as after i post the documents, the Tax Input text should also be there.
I have tried to use Substitution. When i click Simulate, the value did copy from vendor line item to Tax Input line item text. But after i click save, i check the document, the text at the Tax Input line item is not there.
In my Prerequisite, i put tcode = FB60. Substitution, i am using BSEG-SGTXT substitute by exit. I have copy the program RGGBS000 to a new program and assign the exit. May i know how can i pass the whole item table instead of checking in structure BSEG in the exit? Because the main point is, the vendor line item and the Tax input line item are different. I want to copy different line item text into different line item text.
Can anyone guide me into this?
Thanks a lot. Appreciate it!

Answer 1

Hi Starry,
Use PROCESS BTE not INTERFACE BTE. Process BTE has the following Parameters :
FUNCTION ZSAMPLE_PROCESS_00001120.
*"*"Local Interface:
*"  IMPORTING
*"     VALUE(I_BKDF) TYPE  BKDF OPTIONAL
*"  TABLES
*"      T_BKPF STRUCTURE  BKPF
*"      T_BSEG STRUCTURE  BSEG
*"      T_BKPFSUB STRUCTURE  BKPF_SUBST
*"      T_BSEGSUB STRUCTURE  BSEG_SUBST
*"      T_BSEC STRUCTURE  BSEC OPTIONAL
*"  CHANGING
*"     REFERENCE(I_BKDFSUB) TYPE  BKDF_SUBST OPTIONAL
Follow the instruction which I had posted earlier. Also check the documentation of the FM. Some important part am pasting here :
The current document headers (there will be more than one for cross-company code transactions, for example), the corresponding line items and the recurring entry data for the document header and the one-time account data are transferred to the additional component, for information purposes only. You must not edit this data. Instead, two additional tables (T_BKPFSUB and T_BSEGSUB) and the structure BKDF_SUBST are also transferred. The contents of the fields that can be substituted are entered in these tables. Field TABIX contains a line number which shows from which line in T_BSEG or T_BKPF the field contents originate.
Thanks & Regards,
Faheem.