Hello Isabella,
Please keep in mind that this community is for SAP Applications (Business Suite / Business Warehouse) running on ASE 
I suspect this is not your situation as the SAP Applications run on ASE up to 15.7 , besides the fact that indexes use to be created from the ABAP layer.
If you have more questions after Bret answer I would suggest to post this on this community: http://scn.sap.com/community/ase-custom-applications
Best regards,
Victoria.