SLT with MSSQL as target

Hi Experts,

We're in the process of setting up the SLT with ECC as source system and MSSQL as target. In the configuration of SLT, we could only select 'HANA' as the Database system in the 3rd step of specifying the target system though we can see the other Database in the dropdown but this dropdown is disable so we can't change from HANA to MSSQL.

Is there anything we need to do in order to enable this dropdown so we could select the other Database ?

Thanks

Alok