Another suggestion Arjun,
you said you have a writeable procedure with you, which will return a result set after the processing. You split the procedure into two, one writeable and one read only, so that the writeable will update the data, and read only procedure would return the required result set. The, use xsjs to call the writeable, and use xsodata to call the read only procedure(complicate it man 
).
Sreehari