Approval routes for cost vouchers can be configured on two different places.
Category Code in the Chart of Accounts
eInvoicing Accounts application

flowchart TD
A([Start]) --> B[Cost Voucher]
B --> C[Create Cost Voucher]
C --> D[Validate Cost Voucher]
D --> E{Appr. in Setup?}
E -- Yes --> F[Obtain approver from Setup]
E -- No --> G{Appr. in CC F0901?}
G -- Yes --> H[Obtain approver from GL Account Cat Code]
G -- No --> I[Manually enter approver]
F --> J[Approval Group type = FAP]
H --> J
I --> J
J --> K[Process Cost Voucher]
K --> L[Pay Status H<br/>Batch pending]
L --> M[Approve Cost Voucher]
M --> N[Pay Status A<br/>Batch Approved]
N --> O([End])