@Anita_punmiya
I have the same requirement like Recipient- > Policies - > Policy risks.
When I create container of policy risks in recipient form as below

After opening recipient input form for particular recipient getting error -
Attribute 'policyId' unknow (see definition of schema 'Recipients (nms:recipient)')
recipient schema don't have policyId so I changed input xpath="recipientId" but since policy risks table does not contain recipientId its throwing error as-
Attribute 'recipientId' unknow (see definition of schema 'PolicyRisks (prt:policyRisks)')
Please help here.
Thanks,