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The top circular edges of a cut cuboid shall be rounded.
Select all side faces of the inner cuboid and the upper face (multi selection with Ctrl key).
Click on the context menu command New Chamfer/Fillet....
Select Fillet and the desired Radius.
When leaving the remaining settings now and clicking OK, the note "Assembly" cannot be created" is displayed.
The blend operation creates geometry with different convexity.
Solution: Enable the checkbox Base surface and in the list field, select Base extrude 1: Vorderseite.