Purchase Order Approvals and Authorisation Limits control how Purchase order can be used. Primarily, they are concerned with allowing who can work on a Purchase order and in what circumstance. Depending on settings that are configured system-wide or for each individual, the behaviour may change.
The concept of approving Purchase orders allows the business manager to have complete control over purchases. While Purchase orders can be created by users, the approval of them is determined by user limits, non-admin limits and system preferences.