Why GN_INVOICE_CREATE has no performance improvement even in HANA landscape?

Hi All,
We have a pricing update program which is used to update the price for a Material Customer combination(CMC).This update is done using the FM 'GN_INVOICE_CREATE'.
The logic is designed to loop on customers, wherein this FM will be called passing all the materials valid for that customer.
This process is taking days(Approx 5 days) to get executed and updated for CMC of 100 million records.
Hence we are planning to move towards HANA for better improvement in performance.
We designed the same programs in the HANA landscape and executed it in both systems for 1 customer and 1000 material combination.
Unfortunately, both the systems gave same runtimes around 27 seconds for execution.
This is very disappointing thinking the performance improvement we should have on HANA landscape.
Could anyone throw light on any areas where we are missing out and why no performance improvement was obtained ?
Also is there any configuration related changes to be done on HANA landscape for better performance.?
The details regarding both the systems are as below.
Suite on HANA:
SAP_BASIS : 740
SAP_APPL : 617
ECC
SAP_BASIS : 731
SAP_APPL : 606
Also see the below screenshots of the system details.
HANA:
ECC:
Thanks & regards,
Naseem

Hi,
just to fill in on Lars' already exhaustive comments:
Migrating to HANA gives you lots of options to replace your own functionality (custom ABAP code) wuth HANA artifacts - views or SQLscript procedures. This is where you can really gain on performance. Expecting ABAP code to automatically run faster on HANA may be unrealistic, since it depends on the functionality of the code and how well it "translates" to a HANA environment. The key to really minimize run time is to replace DB calls with specific HANA views or procedures, then call these from your code.
I wrote a blog on this; you might find it useful as a general introduction:
A practical example of ABAP on HANA optimization
When it comes to SAP standard code, like your mentioned FM, it is true that SAP is migrating some of this functionality to HANA-optimized versions, but this doesn't mean everything will be optimized in one go. This particular FM is probably not among those being initially selected for "HANAification", so you basically have to either create your own functionality (which might not be advisable due to the fact that this might violate data integrity) or just be patient.
But again, the beauty of HANA lies in the brand new options for developers to utilize the new ways of pushing code down to the DB server. Check out the recommendations from Lars and you'll find yourself embarking on a new and exciting journey!
Also - as a good starting point - check out the HANA developer course on open.sap.com.
Regards,
Trond

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