Claim Approval error

Hi All,
I am calling approval API for claim payment settlement as "Credit Memo",  ozf_claim_pub.update_claim  is giving error like "The Credit Memo reason cannot be determined. Please validate your setup." and "Invalid Workflow Role for Approver" even though the default owner is setup and active in wf_roles table.
Do we need to pass any mandatory values for "Credit Memo" for approval?

Thanks in advance.