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SAP S/4HANA 1709 Table Simplification & Compatibility with Native HANA

Sep 21, 2017 at 05:51 PM

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Hi All,

I had 2 questions regarding S/4HANA interaction with a native HANA.

1. Since the FI tables have been simplified, the original tables like BSEG have become views in S/4HANA. How does it impact scenarios where BSEG was being replicated via SLT to another native HANA system. How does the trigger based replication work on a case when BSEG is a view now.

2. S/4HANA 1709 is on HANA 2.0. What impact does this have on a target native HANA system? Should the target native HANA system also be on 2.0?

Thanks in advance.

Regards,

Shyam

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Best Answer
Lars Breddemann
Sep 25, 2017 at 04:20 AM
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ad 1) As SLT replication is based on data changes in tables, the new tables will have to be replicated with S/4 (quite obvious, don't you think?).

ad 2) I'm not aware of technical limitations that would stop a HANA 1 system from being a replication target for a HANA 2 source. However, when you're already using a HANA 2 instance you probably do not want to go "backwards" with using a HANA 1 target. Also, as always, check the specifics in the SLT documentation and SAP notes relevant to your release.

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Thanks Lars.

About the SLT, yes it is quite obvious that the SLT shouldn't break. SAP surely won't create chaos on it's current implementations :).

I am a bit more intrigued to know how the trigger based replication works on these views now.

Maybe it is a silly question but wanted to understand how SLT on views is different from SLT on Tables (if at all they are different).

Thanks for your time again.

Regards,

Shyam Uthaman

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I see two options here:

1. HANA supports the INSTEAD OF trigger, but only on views. So if your application tries to insert into a view, you can write code to do something with that data instead. That would be one option to do it.

2. The changes made to data in compatibility-views effectively are changes in the new base table. A SLT trigger on that base table will catch all changes that came in via all compat-views. This could be the other option.

As I understand it, in S/4 both the compat-views and the base tables are used to capture data changes. So, in order to avoid "double counting" of changes that come in through compat-views, I assume that option 2 is the one that is actually used most of the time.

Alas, I don't have a S/4 system nor an SLT setup at hand to verify these thoughts.

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