Is it possible that you have multiple bodies in this part and the material was not assigned to all bodies, or a body occupying the same space? I just tested NX11.0.1 and having assigned a material, applied constraints and load cases, the optimization was successful. The only time I get that message is when a material is not assigned.
We are aware of the non-English lanugauge support and looking to see how we can address this in the future.
Product Manager for Topology Optimizatin for Designers.
I am facing a similar issue in NX12 : when clicking on Setup Optimization, the error message "No material assigned to a design space or a scenary body" pops up.
I am running NX in English.
I can see in manage bodies menu that column "Material" is set to None for my design space.
However, even after assigning a custom material to it using Assign Material menu, the "Material" field of the Manage Bodies window remains to None.
However, after changing custom environment to another containing no site dpv file, assigned material correctly appears in the dedicated column and the error message does not pop up anymore.
Any idea about where this might come from? Seems like some preference in dpv file is causing the issue...