hi Sajoy,
IF you go to the manage of cube, you will find an available for reporting sign in the infocube - whichever request has this is available for reporting.
Tables:
RSMDATASTATE SIDs are the same as the request no that you see (in request tab in 'manage'). Request IDs in the target can be checked in RSICCONT table.
The value in RSMDATASTATE tells the max value for which QM is ok, or, tech status is ok (as I understand it). This with RSICCONT table should tell us which all requests are there in the cube (that are available for reporting).
Hope this helps!
Sheen