Feature Tree Order

Hi,

there is something with the feature tree order of features that I don't understand.

I am trying to reuse a surface and it's sketch. I deleted the relations that the sketch had and dragged them both to the bottom. When I tried to edit the sketch and give it some relations everything above it, up until its original location, got greyed out - not making it impossible to reuse.

Can anyone tell me why this is happening?

Thank you

SolidworksSurfacing