Line Item numbers out of sequence in C_T_DATA

Question

We are using several different data sources within include ZXRSAU01.
For one of them, we have assigned a custom structure ZOXNRD0112 to C_T_DATA which contains two different fields for Line Item number. One of these fields is based on FAGLFLEXA-DOCLN and the other is based on BSEG-BUZEI.
The values in these two fields should agree on each record contained within C_T_DATA, but occasionally we get a situation where they do not. BUZEI is always correct when compared to the Billing Document, but DOCLN will be out of sequence.
For example:
DOCLN BUZEI
000001 001
000003 002
000002 003
DOCLN & BUZEI both arrive already populated in the C_T_DATA table.
We simply use the values as keys to read FAGLFLEXA and BSEG, the values in DOCLN & BUZEI themselves are not derived.
They are there when entering the user exit ZXRSAU01, and they are still there when processing leaves ZXRSAU01.
I donu2019t have a lot of experience in BI, and am not familiar with how C_T_DATA receives itu2019s data.
Iu2019m trying to look back further in the processing to find where C_T_DATA is populated and draw some conclusions from that. I have asked a couple of our FI people to examine the documents involved to see what could be going on there.
We are on ECC 6.0, and BI version 7.0.
Has anyone out there run into this kind of problem before?

Answer 1

Hello Dan,
Welcome to SDN!
The program ZXRSAU01 is an exit program for transactional DataSource extraction. Whenever the DataSource pulls data from ECC, it usually divides the data into several data packages, and for every package it will comes to that program. The internal table C_T_DATA contains all records of the data package.
We don't use sequence to link data together, but use fields mappings. For example, I want to read FAGLFLEXA-DOCLN, I first need to find a key field say XXXX which exist both in C_T_DATA and FAGLFLEXA. Then use below statement to read FAGLFLEXA:
loop at c_t_table into ls_structurename.
select single DOCLN
    from FAGLFLEXA
    into ls_structurename-docln
  where XXXX = ls_structurename-XXXX.
  modify c_t_table from ls_structurename.
endloop.
With the code we don't need to worry about sequence. And it works for either full loading or delta loading.
Please let us know if you have any questions.
Regards,
Frank