How can I implement security employees expense reports

 The company I work this into the implementation stage and asked to review security in the AP module. In my business responsibilities were established by company and by divisions such as IPC Mexico Boss AP and IPC Cardenas Boss AP. Checking the option expense report, I found that searching an employee of a specified company shows you all the employees of all companies, and that's not right, since it must show only employees of a company

My question is how can I do? How do I apply security in employee expense report? That option is configured in the AP module or Human Resources?