Can we frame a VO which is a combination of EO based VO and SQL based VO?

Is it possible to create a VO which is a combination of EO based VO and SQL based VO? Is the resultant VO capable of inserting data in the database?

Fortunately, this is such a common use case that it's documented how to do this:
http://docs.oracle.com/cd/E26098_01/web.1112/e16182/bcquerying.htm#CEGEGHFB
and
http://docs.oracle.com/cd/E26098_01/web.1112/e16182/bcquerying.htm#CHDHBDDE
are the two sections you need to read.
You don't need a "combination" VO, and in both cases, the base EO of the VO is updatable/insertable
Note: This is why the best course is to state your use case (problem) - not failed or attempted solutions - when posting questions on OTN.

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