ADF CDM Source Transformation not reading data

Question

I am having an issue with the inline data set for Common Data Model in Azure Data Factory. Simply, everything in ADF appears to connect and read from my manifest file and entity definition - but when I click the "Data preview" button, I always get "No output data" - which I find bizarre, as the data can be read perfectly when using the CDM connector to the same files in PowerBI. What am I doing wrong to mean that the data is not read into the data preview and subsequent transformations in the mapping data flow?

My Manifest file looks as below (referring to an example entity):

{
    "$schema": "CdmManifest.cdm.json",
    "jsonSchemaSemanticVersion": "1.0.0",
    "imports": [
        {
            "corpusPath": "cdm:/foundations.cdm.json"
        }
    ],
    "manifestName": "manifestExample",
    "explanation": "example",
    "entities": [
        {
            "type": "LocalEntity",
            "entityName": "Entityname",
            "entityPath": "folder/EntityName.cdm.json/Entityname",
            "dataPartitions": [
                {
                    "location": "folder/data/Entityname/Entityname.csv",
                    "exhibitsTraits": [
                        {
                            "traitReference": "is.partition.format.CSV",
                            "arguments": [
                                {
                                    "name": "columnHeaders",
                                    "value": "true"
                                },
                                {
                                    "name": "delimiter",
                                    "value": ","
                                }
                            ]
                        }
                    ]
                }
            ]
        },
...

Answer 1

I am having exactly same output message "No output data". I am using json not manifest. If i sink the source it moves no data but without error. My CDM originates from PowerBI dataflow. The PowerApps works fine but historization and privileges make it useless.

Edit: On Microsofts info on preview feature we can find this screen. I will make a guess that CDM the ADS sources is not the same which orignates from Power BI.