What experience do you have managing purchase orders and invoices?

Remember to include your experience managing internal billing between the departments of a company if you do not have experience working with formal invoices. The process of accounting for line-item charges and presenting total cost for reimbursement between cost centers is somewhat similar to external invoicing. An interviewer may accept this as an acceptable level of experience for the open assistant project manager position.

"I have not yet had the opportunity to formally work with purchase orders or invoices in a professional setting. However, I am generally familiar with both concepts and how they are used to facilitate purchases and sales between companies, vendors, and clients. I would welcome the opportunity to learn the details of working with these important concepts if offered the assistant project manager position at your company."