line cover cover disappeared!

[stevini]

Hello everyone,
I created two separate bonfires that form a complusion, I joined them (sommate) with operations with solid elements, and everything went well until in section, I disappear the section line of the cover in question! remains the internal retino but no section line! Can you help me?
Thank you very much
ps: use archicad14

 

[DarthVader]

but what did it serve to sum the two bonfires?

 

[stevini]

I solved! simply did not match perfectly and therefore did not join them automatically