An employee could fraudulently add items to the sales order and/or delivery and issue goods to customer to create fictitious revenues.
If the additional goods were shipped to customers to create fictitious revenue, there are detective controls in place that would identify any material variances in the revenue accounts. Detailed reviews of revenue and expense accounts are performed at least quarterly that compare actual results to prior period actuals and budget. In addition, controls are in place to document, investigate, and resolve issues raised by customers that result in payment issues.