Update DB Stats for DSO

Hi Friends,

I want to build DB stats for DSOs as done by DB20 transaction in SAP . The only difference being in DB20, the DB stats gets created only after the % Deviation is greater than 50%.  I want to automate the creation of  DB stats for DSOs based on the value of % Deviation inputed  manually.

Can anyone help me or throw some light on this.

Thanks,