Available with Standard or Advanced license.
The pixel type of the raster associated with the mosaic dataset item indicates that the raster's radiometric range might be too low for the pixel type defined for the mosaic dataset.
There are one or more mosaic dataset items that have a smaller bit depth than that of the mosaic dataset.
In the Stretch function, the General tab has an Output Pixel Type parameter. Make sure that the pixel type in the function matches the pixel type of the mosaic dataset. Using the Batch Edit Raster Functions wizard to insert or edit the Stretch function can be helpful.
Alternatively, you can open the Mosaic Dataset Properties page and edit the pixel depth property to match the pixel depth of the mosaic dataset items.