Bill Management Create Dispute and Payment Issue

Summary

Error message 'Attribute CustomerTrxId is required' is displayed when we click ' Request Credit' in Bill Management UI

Content

Hi,

We are trying to check what's causing the issue when we tried to click 'Request Credit' in the Bill Management UI, it shows below error message.

Attribute CustomerTrxId is required'

Did someone encountered the same when trying to disputes transactions in External users Interface? 

Kindly advise and/or share your inputs.

Thanks,

Miles