Why can't i set the default value on an AmbientSound variable ?

Development Pipeline & Plugins Editor Scripting
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1

Hi,

I created an AmbientSound actor in my level and would like to make it the default value of an AmbientSound variable in a blueprint.

Unfortunately i get an “editing this value is not allowed” message in the default value section:

10126-ambientsounddefault.jpg

The blueprint has been compiled.

Am i misunderstanding something ?

Thanks

Cedric