In MediusGo it is possible to use two different types of approval rules, Hierarchy or Direct Approval. 

Direct approval requires only one user to approve each coding row, while Hierarchy requires multiple authorizers on each row. If you are unsure which type your company uses, go to System Configuration - System Settings - Functions and look at the parameter UseAttestHierarchy. If the parameter is Yes, you use Hierarchy, if it is No, you use Direct Approval.

Direct approval

A number of approval roles are set up where only one role needs to approve each coding row before it can be sent for payment.

If your company uses Direct approval, you can read more about the set-up in the article Approval rights - Basics

Hierarchy

Approval rules are set up as a staircase with different amount levels, the invoice always starts at the lowest step and goes up the hierarchy until the amount level is reached. If your company uses Hierarchy, you can read more about the set-up in Approval Rights - Basics and Hierarchy