Yes, those plaster are same as external plaster, I am keeping color for plaster fill different just to recognize it easily.
Wall is starting from top of the core of the slab.
To get rid of those lines , I just did as per attached image, just changed line type color for plaster of Complex beam & finally it worked.
As per your suggestion, adjustment to Slab can be done for Wall shown in Red Rectangle.
Thanks to all to their prompt reply.
Regards,
Ratna
AMD Ryzen 5 3600 6-Core Processor 3.59 GHz
Ram - 16.0 GB
System - Windows 10 Ultimate, 64 bit
NVEDIA GForce 8400GS
Archicad 9..., 24