Data extract/convert from SAP system and load to Unix system - Urgent

Question

Hi,
I have a requirement that I need to extract data from SAP and each data field will have some conditions and need to map/Load it to the Legacy Unix system.
there are four kinds of data objects of HR system, need to extract them individually and map those into Unix system.
Can anyone please suggest me step-by-step how to go about it....like
do we need to write a report for that?
do we need to use Function modules? etc.,
How to set mappings of that Data to a file?
How to map that file to Unix system?
Need to run those on daily basis and after first run, only changed data file need to be loaded. how to do this?
thanks
Alankaar
rewarded with the points.

Answer 1

Hi
I can't say this becouse I don't the problem, anyway u have to do it by yourself.
U should create:
- a document where u define the file format: data type, size and name of the field of the unix system;
- a document for the mapping: link between SAP fields and Unix system fields
Based on these document you'll create a structure on the report:
DATA: BEGIN OF STR_UNIX_SYSTEM,
             FIELD1 ...,
             FIELD2 ...,
             FIELDN....,
           END  OF STR_UNIX_SYSTEM.
and the code to transfer the data from SAP to legacy:
MOVE: <SAP TABLE>-FIELD TO STR_UNIX_SYSTEM-FIELD1,
So all steps have to be defined in the report before downloading the file.
So I don't know which legacy system you're speaking about, after creating the file the legacy should read it in order to upload the data.
U can create a daily job for that report, if you need to transfer the changed data only you should read the change document table (CDHDR and CDPOS) but I don't know HR so I'm not sure these tables are available for HR.
Max