problem with complex profiles and garbage lines in section

[Anonymous]

HI,
i have a problem with a complex profile .here is the situation:
i have a beam complex profile and a column complex profile. both have plaster as finish and the beam is connected to the top of the column.
in a section view i have garbage lines that i do not know how to avoid them.
please someone help.
i am attaching the pln file with the column and the beam only
thanks

[Anonymous]

ok. the rar file is over the 256kb and it is imposible to post it here. i
hope someone see and understand from the picture what i mean.
both the finishes are plaaster with the same linetype.the beam intersects the column plaster for about 10mm at the top of the column and that is VISIBLE.
how can i avoid this?
also plaster has the same priority on both complex profils.
thanks

[NandoMogollon]

Can you post a better picture? maybe even' a 3D view?