An engagement supervisor noted that an internal auditor's personal relationship with a process owner resulted...

To manage the impairment caused by an internal auditor's personal relationship affecting audit impartiality, a functional audit committee should be utilized. The audit committee is responsible for ensuring the independence and objectivity of the internal audit function. This committee can take actions such as reassigning the audit task, reviewing the affected audit work, or instituting additional oversight for audits in that area.

The IIA's Standards on objectivity and conflicts of interest (specifically standards relating to managing impairments to independence and objectivity).