Senior management has the primary responsibility for resolving any fraud incidents found as a result of the investigation in the treasury department. While the internal audit activity may identify and report on fraud, and forensic accountants may assist in investigating it, the responsibility for addressing and resolving incidents of fraud, including implementing corrective actions and holding parties accountable, rests with senior management.
The IIA's guidance on the roles and responsibilities in fraud investigations, which places ultimate responsibility for management of fraud risks with senior management.

Part of the internal audit activity's duties includes assisting management in developing processes and controls to manage risks and issues. While internal auditors are primarily responsible for evaluating the effectiveness of risk management and control processes, they also play a key role in advising and consulting with management to help design and improve these processes, thereby adding value to the organization.
The IIA Standards: Standard 2130 - Governance: "The internal audit activity must assess and make appropriate recommendations to improve the organization's governance processes for making strategic and operational decisions, overseeing risk management and control, and promoting appropriate ethics and values within the organization." IIA Practice Guide: "Consulting Services and the Internal Audit Activity": Discusses how internal auditors can provide value-added services, including assisting management with process improvements and control development.

According to the IIA's standards on proficiency, the Chief Audit Executive (CAE) should consider primarily how well the skills and experience of a new auditor complement those of the existing audit team. This ensures a diverse and comprehensive skill set within the audit team, aligning with the Standard 1210.A2, which stipulates that the internal audit activity collectively should possess or obtain the knowledge, skills, and other competencies needed to perform its responsibilities.
Institute of Internal Auditors (IIA) Standards, specifically Standard 1210 on Proficiency.

Incorrect acceptance risk refers to the risk that an auditor concludes that a financial statement assertion is not materially misstated when, in reality, it is. This type of risk is particularly relevant when performing substantive testing on balances such as inventory, where the auditor uses sampling to draw conclusions about the entire account balance.
Auditing standards regarding audit sampling and risk assessment, including the concepts of Type I and Type II errors in auditing.

To achieve conformance with the Standards, a newly hired entry-level internal auditor must possess an understanding of fraud and fraud risk. This knowledge is essential as it enables the auditor to recognize potential indicators of fraud during their audit activities, thereby contributing to the organization's broader fraud risk management efforts.
IIA standards which emphasize the importance of auditors understanding fraud risks as part of their professional competence requirements.