Default coordinate system of map frame in Pro doesn't match the feature service spatial reference

[MapsAreFun]

Hi,

I have a feature service that is published with a spatial reference of 7844 (GDA2020).  When this service is dragged into a new map frame within ArcGIS Pro the coordinate system of the map frame automatically changes to match the source data instead of setting it GDA2020.

The source data coordinate system is WKID 3577 - GDA 1994 Australian Albers. A transformation from GDA1994 to GDA 2020 has been set in the mapx that was used to publish the feature service. Attached is a screenshot of the transformation that has been used.  Does anyone know why Pro is taking on the source data coordinate system instead of the service spatial reference?

 I am using ArcGIS Pro 3.1.2

[HarishKV]

its because of the default option. You can change it as far as I know.

[MapsAreFun]

Thanks @HarishKV, 
I have the default set to "Use spatial referenece of the first operational layer" as shown in the snapshot you sent.  However, it is not using the spatial reference of the feature service.  It is using the spatial reference of the source data that is within the service itself. 

[DanPatterson]

That, I suspect is what is meant by "operational layer"... the source data used to create the layer

[MapsAreFun]

It only occurs on feature services which contain dataset that have projected coordinates. If I drag in a feature service where the source data is in GDA 1994 geographics and the service has a spatial reference of 7844 (GDA2020) then the map frame matches the service instead of the source data. 

[ChristopherCounsell]

WKID 3577 - GDA 1994 Australian Albers is a projected coordinate system.

All projected coordinate systems have an underlying geographic coordinates system. It's what they're projected from.

Datum transforms are between geographic coordinate systems. So with GDA 94 as the underlying datum, that's why you're seeing transformation between it and WGS84.

You can project on the fly without a datum transformation e.g. gda94 > GDA 94 MGA 56