Unable to View Record through specific responsibility

Hi,

I can access the record fine through [UK HRMS Manager] or any other responsibility. However, there are couple of responsibilities through which if i go to a user record, it shows this error.

This field sits in People Group Flexfield, when clicked [OK], blank record shows on this field. Through other responsibility, no issue can be reported as mentioned above.

Any idea what's causing this?

Thanks

Imran