No user key can be used for the Integration Component instance

Hi,

I am getting mentioned error when trying to "Upsert" EAI Siebel Adapter BS. But, the record is getting created with missing information.

Error Message: “No user key can be used for the Integration Component instance”.

Case:

a) I am trying to insert Account with Email, PhoneNumber, Address details being child IC's.

b) Parent IC: Account >> Child IC: Phone, Email, Address

c) Child IC: Phone, has Phone Number as required and the IC cardinality is set to "One or more".

d) Also the BC "Account" which is the IC "Account" is tagged to as External Name, has a prewrite script to check the Phone Number is not null based on some business logic.