Hi Jatinder,
I think it is technically possible to switch from Sandbox ECC to DEV ECC as a source system of SLT.
Let's assume you want to use the same schema in HANA as a target.
Even when you delete the connectoin configuration in SLT t-code LTR, the configuration of the target HANA system will NOT be removed. Hence you can remove the configration for Sandbox withouth taking effect to the HANA.
Before removing the configuration, I would recommend you to "Stop Replication" with the HANA studio in order to have consistent status.
And you would need to know that a HANA user which has same name as the schema name was automatically created when you connected the sandbox system to the HANA via SLT.
This HANA user is different from the user you specified in the LTR configuration.
And when you try to re-configure the SLT setting for the DEV system replicating to the existing HANA schema, you need to specify the same schema name in the "Configuration Name" field of LTR.And as the same HANA user name is already in the HANA system, you are asked to specifiy the password of the HANA user. As the password of the HANA user was automatically created at the time of user creation, you may need to change the password of the HANA user with HANA studio beforehand.
You hav to be sure that SLT will try to drop the existing tables, create tables and load the data at the time of "Initial Load" for the DEV system.Once thre was the case we needed to reactivate HANA Views after the initial load.
If you want to use different schema in HANA, things will be more easy.
Best regards,
Makoto