DS Enhancement Question !

Hello experts,
I wanted to understand some basic concepts of DataSource Enhancements., I am sorry to put such kind of wide and often asked thread again. But unfortunately i couldnt find clear understanding form the existing Posts and from SAP help site.
Here are my first Phase questions !
1) Can we do Enhancement to All the DS? ?Means those form SAP given and ZDS ?
2) 0DS ( SAP Given ) are build on multiple SAP Tables..Correct ? so if i have to enhance that, where do i specify those Joins of Tables ? The same way when we create ZDS ( View based ) and for view we define conditions and Joins.
3) Which DS are not Enhanceable ? If any ?
4) Can we do enhancement to 2LIS ...DS?
i guess let me first clear these basic questions..and then i have some more for each..
Thanks. for your time..

Hi Honar ,
Can we do Enhancement to All the DS
1.standard datasources are usually based on FM and SAP not allow us to change them .So we enhance them by adding some fields in there append structure and then populating them via cmod code .
2.Sometime for Z data sources also we do the same thing if changes in there basic struture are not feasable .
ex: A datasource is based on a view and we just need one more field from some other table then instead of changing view itself we just enhance data source for 1 field .
0DS ( SAP Given ) are build on multiple SAP Tables
Usually they are FM based .
We can't change them .So to enhance them we create an append structure and then add our fields in that .After extraction from FM or Tables CMOD code will get excuted and will populate fields from Append structure .
Which DS are not Enhanceable
All datasurces with a structure can be enhanced .
Can we do enhancement to 2LIS ...DS
yes .You can check lots of threads in SDN for the same .
Hope this will be helpful .
Regards,
Shreya

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