SAP C4C SDK How to create a SOVS for Relationships in Customer?

Hello Experts,

In one of my Custom BO, i have a requirement on a field to display all the ship to party of a customer.

The ship to party is listed under the Relationships tab of an account. The expectation is passing an account ID the OVS should bring all the BP's with a particular Relationship type.

Since, there is no Public OVS, I tried to create a custom OVS. Again, since there is no

QueryByElements on Customer to pull the Relationship data, i tried to go with SADL query.

I get this error, please help me to understand what is wrong here.

Thanks

Gayathri