I published a mxd to ArcGIS.com as a feature service. The mxd dataframe was in epsg:3111. ArcGIS.com converted the spatial reference to ESRI's wkid 102171 (not sure why).
Now, the Javascript app uses a base layer (WMS) that must be requested as epsg: 3111. I can set a Javascript map object to have a spatial reference of 3111 via its initial extent. All well and good, the base layer loads fine. However, because ArcGIS.com converted the spatial reference of the mxd to 102171 during publishing I am unable to add the feature service over the base layer (even though 3111 and 102171 refer to the same coordinate system). If I make the map object's spatial reference 102171 the feature service loads fine, but the base layer doesn't.
I will cross-post this on the ArcGIS online forum, but just wondered if anyone had encountered this here.
