Copying Structures and Boolean operations

[FemkeV]

I have some problems with copying structures to another structure set. I have 2 structures in my StructureSet A: GTVp1 and GTVnsum. GTVp1 is a high resolution structure, GTVnsum is not. I copied both of them to StructureSet B, which makes them both Default Accuracy structures (because of the copying? I used the SegmentVolume property to copy to a new structure). However, if I want to make them high resolution again, to be able to combine them with another structure in StructureSetB, e.g. Lungs, I am not able to do this for GTVp1 (which was already high resolution). I get the message that the structure cannot be converted to high resolution. This means I cannot convert a structure to be high resolution again, if it was in the original structure set, after copying. Any idea how I can solve this? Because I need to use the structure again for a boolean operation.