Here are some links to the mendix reference material for OData:
→ Use the SAP OData Connector - Mendix 7 How-to's | Mendix Documentation
→ SAP OData Connector - Mendix 7 Reference Guide | Mendix Documentation
This is the academy training for working with OData and mendix:
→ https://gettingstarted.mendixcloud.com/link/module/84/lecture/560
Hope it helps