I have a strange situation where I am unable to include any lines from a part in the upper levels.
the screenshot is in a sketch in a part created in place and the blue part is in the assembly, I can not select any edges with the include command but I can select the sketch, the part is activated.
What is strange is the blue color, it should be gray.
Thanks for asm.
I am able to include any geometry, so there should be something different on your system.
My suggestions: I have ST9 with latest MP, according to file prop. of your files you have ST8 with no MP. Do you have a chance to upgrade SE to latest release or at least can you instal latest MP for ST8? It is possible that there were a some small bugs in initial release of ST8.