DSO activation failed in BW 7.3

Good Evening Guru's

       I am facing error when i am creating Customised DSO in BW 7.3. And error is" Error when creating the export DataSource and dependent Objects" & "DataSource 8ZSDSO_D2 does not exist in source system DEVCLNT001 of version A".  how I have to solve that, can you please guide me.