dataReductionAlgorithm not working for Rows and Columns in Matrix Dataview

[lucmax]

Hi,

I'm trying to use the fetchMoreData (segmented fetch) functionality within my visual that uses a matrix dataview. For this to work we need to add dataReductionAlgorithm to the capabilities.json. This works fine if we just add it to the rows but if we add it to the rows and columns we just get this error:

Activity ID: 12c03dfa-ab05-413f-94e7-f42204cc6b93
Request ID: 7f254adc-d15b-2636-4319-0f826e68da06
Correlation ID: b069f53b-3faf-ab67-cf2e-060d80bdabab
Time: Fri Aug 06 2021 14:27:56 GMT+0200 (Mitteleuropäische Sommerzeit)
Service version: 13.0.16512.57
Client version: 2107.4.07056-train
Cluster URI: https://wabi-west-europe-d-primary-redirect.analysis.windows.net/

What are we missing?

dataViewsMapping in capabilities.json

"dataViewMappings": [
        {
            "conditions": [
                {
                    "A": {
                        "max": 1
                    },
                    "B": {
                        "max": 1
                    },
                    "C": {
                        "max": 1
                    },
                    "D": {
                        "max": 1
                    },
                    "E": {
                        "max": 1
                    },
                    "F": {
                        "max": 1
                    }
                }
            ],
            "matrix": {
                "rows": {
                    "select": [
                        {
                            "for": {
                                "in": "A"
                            }
                        },
                        {
                            "for": {
                                "in": "C"
                            }
                        }
                    ],
                    "dataReductionAlgorithm": {
                        "window": {
                            "count": 1000
                        }
                    }
                },
                "columns": {
                    "for": {
                        "in": "D"
                    },
                    "dataReductionAlgorithm": {
                        "window": {
                            "count": 1000
                        }
                    }
                },
                "values": {
                    "select": [
                        {
                            "for": {
                                "in": "E"
                            }
                        },
                        {
                            "for": {
                                "in": "B"
                            }
                        },
                        {
                            "for": {
                                "in": "F"
                            }
                        }
                    ]
                }
            }
        }
    ],

Regards,

lucmax

[lucmax]

Has anyone a working example for the fetchMoreData (Segements aggregation mode) functionality within a matrix dataview and can share it with me? Still not able to get this working.