NWDI Upgrade !

Question

Hi All,
We need upgrade our application from SPS18 to SPS20.I am unable to find related notes on SAP service. Can of you help me in finding the actual notes to be analyzed on SAP services.
I am not sure what all documents I am supposed to look into before upgrading application. 
Thanks and Regards ,
Vanita kulkarni

Answer 1

Dear Vanita,
Please go through Ervin's reply thoroughly, it covers your doubt.
Always remember one rule.
For every new release version of Application server, there's a compatible version of developer studio (NWDS).
And as per the best practice, we should always work in the version homogeneity as explained earlier.
So, If you are upgrading you EP server from...
version 7.0 EhP(A) SP(X) to version 7.0 EhP(A) SP(Y) ,where X < Y then,
you need to download the same developer studio version too, from SAP service marketplace.
And yes, all your existing projects will still work in the upgraded environment, as it is backward compatible.
You may encounter the obsolete warnings for certain projects,
but still you will be able to build and deploy your projects successfully without any compilation errors.
Also remember, that if you have NWDI in your landscape,
then, as a part of upgrade (in your case SP16 to SP20) you need to download the same version of .SCA files from SAP service marketplace and paste it into CMS transport directory (<specified in the domain tab>\CMS\inbox) in order to make these dependencies available for your tracks.
and then update all your tracks runtime systems, (Dev and Cons) with this latest version of SCAs that you will be using as a build time dependencies in your track SC as descibed in below mentioned procedure.
Step-by-step procedure for adding the new release of build time dependencies to your track.
1) Open the following URL to access NWDI web interface www.http://<hostname>:<port number>/devinf
2) goto Change Management Services
3) Open System Landscape Directory
4) Click on Software Components
5) Here in the Filter give your Software Component name
6) after the serach is over select your SC in the table and the below displayed tabs goto Dependencies.
7) in the Context dropdown chose "BuildTime"
8) click on "Define Prerequisite Software Component Versions"
7) In the Name column of the table search for the standard SC dependencies that you desire (for e.g. SAP-JEE, SAP_BUILDT, SAP_JTECHS) and then add one by one as a dependencies.
8) once you are done with this, go back to the 2nd step mentioned above.
9) Goto the Landscape Configurator link.
10) Chose your track inside the table on the left side.
11) goto the Domain Data option, Click on the "Change" button, and then click on "Update CMS" button (This may take some time)
12) once the CMS Update is finished, open the "Track Data" link that is beside "Domain Data"
13) Now click on the "Change" button, from the software component (SCs) table remove the WebDynpro SC, and add it back once again.
14) Save the Track Data.
15) Now goto Transport Studio, make sure your track is selected in the table
16) In the Check-In Tab select all the components displayed in the "Check-In" button.
17) Once the Check-In operation is completed all those component will now be queued up in the Development Tab,
18) In the Development Tab select all the components & click on "Import"
19) Once the Import operation is completed all those component will now be queued up in the Consolidation Tab,
20) In the Consolidation Tab select all the components & click on "Import"
21) Now come back to your NWDS and remove the configuration that you have imported previously and then again load the same configuration once again from the SLD.
You can repeat the same procedure for all your tracks present in your landscape.
Please revert in case of any further clarifications.
Regards,
Shreyas Pandya