Your layer is m-aware. If you are editing the feature service through REST or SOAP endpoints you will be unable to edit feature geometry unless you supply an m value with the edit.
Solution
- Do nothing. If feature geometry is not to be edited, or if it is to be edited and you will be supplying m values with the edits, then you should be fine.
- Alternatively, you can remove the layer from your map if it is not needed.
More information
If you have data that has m-values, these features can be deleted, new features can be inserted, and the attributes of existing features can be edited, but the geometry cannot be edited. All new features will have their m-values set to NaN when inserted through the REST and SOAP endpoints. If features with m-values are edited through the feature service in ArcMap with the local editing commands, all editing operations are supported.
If you are planning on using the feature service for editing, it is recommended that you only add data to the map document that you want to edit (the operational layers). Data that you don't want to edit, such as basemap layers, should be published in a different service.
Learn more about planning your operational and basemap services
Another alternative is to use an ArcGIS Online service that can be used as the basemap.
Learn more about designing a map to overlay ArcGIS Online, Google Maps, and Bing Maps