Hi Hendrik,
there are a few issues in your flow:
1. you should update line 18 in your metadata.xml. the namespace of the entiryType is missing the "de" in the beginning.
<EntitySet Name="privmailinfoset" EntityType="de.mindsquare.privmailinfo"></EntitySet>
you can easily find semantic issues in your metadata by using the OData Model Editor
2. The "Local URI" of the Data sources should be: localService/metadata.xml
3. you are missing the model declaration in the manifest.json file. please add the following under "sap.ui5" -> "models"
"": { "dataSource": "mainService", "settings": { "defaultBindingMode": "TwoWay", "defaultCountMode": "Inline", "refreshAfterChange": false }
Best regards,
Elina