go to rsa1
left hand side meta data repository find your dso
in the tab find out queries where the dso been used.
If no query then you can delete the SID.
* in case you delete the SID of DSO and there is any query run on top of that dso, then the sid will be generated at run time and you will get the result.
But imagine the response....it will be super slow.
Thank-You.
Regards,
VB