Draftsight 2018 SP1: Hatch Modification Issue

Hello

I use the "hatching" tool a lot in my field of application. In previous versions, I could easily create hatch areas and then add shapes inside them and subtract the hatching inside these new shapes either by selecting the entities or specifying the internal points. With the 2018 SP1 version, I can't do that anymore. When I select the area to subtract, it tells me that it's a duplicate outline. There is indeed an option in the command window "Deselect outline", but it doesn't work or I don't know how to use it.... It's really very handicapping because I have to delete the hatching area to recreate it once my plan is completed, hoping I haven't forgotten anything...

I just hope that my explanation is clear because it's not easy to format...

If anyone has the solution and could explain to me how they do it, I would be very grateful. Thank you in advance.