Hi Chiranjeevi,

Thanks for posting the query. PFB detailed explanation of keyed data pages and parameterized data pages

Keyed page access:

For list-structure data pages, you can allow read-only access to embedded pages in the data page by using any properties as the key.

Select the Access pages with user defined keys check box to allow read-only access to individual objects in the list based on the value(s) provided for the key(s) specified in the Page List Keys field.

Select the Allow multiple pages per key check box if the keys are not unique across objects in the list. This provides read-only access to a list of objects that match the value(s) provided for the key(s) in this case.

This is what the documentation for the Keyed Page access specifies for the Data Page List.

Parameter Data Pages:

Each time that you reference a data page with different parameters, an instance of the data page is created on the clipboard. You can have multiple instances of a data page on the clipboard, each one created by a reference with different parameters from the others, or, if you have checked the Limit to a single data page check box on the Load Management tab, each new reference to the data page creates an instance of the data page that overwrites any existing instance.

Subsequent references to a data page using parameters that result in a reference to an existing instance of the data page on the clipboard refer to that existing data page unless the conditional refresh strategy indicates the page should be reloaded on each reference.

Note: Report definitions cannot reference data pages that themselves take parameters (such as D_page1[param1:D_page2[param2:Param.P1],param2:pxRequestor.pyUserIdentifier].pyLabel) to populate columns, although they can directly reference properties in a data page (such as D_page1.companyName).

Hope this explanation will help you to understand both the concepts in data pages.