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BW/4 HANA Conversion In-Place - Source system

Hi,

I have a doubt regarding source system conversion. When we get to the step “Define Object Mapping and Store Object List” in RSB4HTRF and if datasource is part of the object list there will be a line item for LSYS (Logical system ) conversion also. As of now we are having SAPI Datasources from ECC and it has to convert to ODP datasources. My BW system is already having an ODP(Extractor) source system established manually.

  1. What name should I give in target source system field of LSYS conversion line ? Can we give the already created ODP extractor source system ?
  2. What will happen to existing SAPI source system ? Will it get replaced if so what will happen to other datasources not yet converted?
  3. There is a separeate line for ODP BW source system and it is dependent on datasources. Why do we need to have a BW ODP source system ?

Really appreciate if you can help on above points

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  • Hi Anil,

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3 Answers

  • Posted on Jul 23, 2020 at 10:58 AM

    Hello Anil,

    What name should I give in target source system field of LSYS conversion line? Can we give the already created ODP extractor source system?

    Yes, you can or even: you should. I did it like you: I let the SAP basis team take care of stting up ODP source system connection. In the transfer tool I then mapped from a SAPI system to an ODP system.

    If you specify a new non existing name, the transfer tool will create a new source system.

    What will happen to existing SAPI source system ? Will it get replaced if so what will happen to other datasources not yet converted?

    Nothing. The SAPI source system (with the datasources) has to be deleted before the system conversion. In my experience it is rather easy, since deleting a source system gets rid of all transformation, info packges, DTPs, etc. But there are some rather tricky parts, when for example a info packages is still used in an process chain. Up to now this is a manual cleanup task.

    There is a separate line for ODP BW source system and it is dependent on datasources. Why do we need to have a BW ODP source system?

    Can you please specify this question a bit further

    Best regards,

    Corvin

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    • Hi Corvin,

      Thanks much for your reply.Very helpful. However I have some more doubts on the same area.

      1. When I select a datasource in a scope transfer of RSB4HTRF i will get two LSYS line items for SAPI to ODP source conversion as shown below. One as ODP(SAPI) and another as ODP(BW). As you confirmed above I can give an existing ODP source system for ODP (SAPI). What about ODP(BW) source ?

      2. Also OPD source created by Basis is having some datasources already. After the scope transfer execution, Would the ODP source system contain newly converted datasources along with other existing datasources ? Or existing datasources will be deleted and new datasource only will be available? My question is everytime when we execute a scope transfer with LSYS line, it will only add new datasources and will not replace / delete existing ones. correct ?

      m2q5e.png (8.4 kB)
  • Posted on Jul 23, 2020 at 08:16 PM

    Hi Corvin,

    Thanks much for your reply.Very helpful. However I have some more doubts on the same area.

    1. When I select a datasource in a scope transfer of RSB4HTRF i will get two LSYS line items for SAPI to ODP source conversion as shown below. One as ODP(SAPI) and another as ODP(BW). As you confirmed above I can give an existing ODP source system for ODP (SAPI). What about ODP(BW) source ?

    2. Also OPD source created by Basis is having some datasources already. After the scope transfer execution, Would the ODP source system contain newly converted datasources along with other existing datasources ? Or existing datasources will be deleted and new datasource only will be available? My question is everytime when we execute a scope transfer with LSYS line, it will only add new datasources and will not replace / delete existing ones. correct ?


    hm3jk.png (8.6 kB)
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  • Posted on Aug 03, 2020 at 03:35 PM

    Hi Anil R,

    since I don't see the system name in your screenshot it is a bit harder to answer.

    I assume there are two different source systems. One is a SAP source system (ERP/ECC). Therefore the source system connection is migrated to an ODP source system.

    The second line is probably another BW as an source system. I don't have any experiences with BW to BW system data transfer.

    I recommend you for each source system to setup an ODP source system. You can do this manually before any TLR. In the TLR you will be asked for a source system ID for the data sources.

    So a "migration" of the source system connection is not necessary but it is possible.

    So to answer you questions:

    1. When I select a datasource in a scope transfer of RSB4HTRF i will get two LSYS line items for SAPI to ODP source conversion as shown below. One as ODP(SAPI) and another as ODP(BW). As you confirmed above I can give an existing ODP source system for ODP (SAPI). What about ODP(BW) source ?

    There should be only one LSYS. Maybe you selected two or more data sources.

    2. Also OPD source created by Basis is having some datasources already. After the scope transfer execution, Would the ODP source system contain newly converted datasources along with other existing datasources ? Or existing datasources will be deleted and new datasource only will be available? My question is everytime when we execute a scope transfer with LSYS line, it will only add new datasources and will not replace / delete existing ones. correct ?

    The existing data source in the target ODP source system connection will be preserved. I am curious what happens, if the same data source already exists though. I never had this situation before.

    A good idea is to try it out on a sandbox system. This was a big help for me in order to understand the migration.

    Best regards

    Corvin

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