https://userapps.support.sap.com/sap/support/knowledge/en/2483828
2483828 - Custom MDF Associations not Visible in ODATA API
In the Odata API you can't see the custom MDF child object Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance...
not visiblecustommdfassociationsodata