Hi Sridhar,
the dates are no single fields, but are stored in a generic way (as you may have n-different date types. Also dates have a category indicating if it is a planned or executed date. ).
You can find a document in note 1414179 (Technical documents for software development in EWM). There is an attachement "DelivServiceProviderCallExamples.pdf" which explains this. The document may contain too much information for you, but you can also have a look at chapter 8 of the document, there class /SCWM/CL_DLV_MANAGEMENT_PRD and method QUERY is explained. This can be used to read ODO data from the system (you must not directly access the database).
Hope that helps you
Best regards
Markus