[NTG-context] Metafun - Metapost capacity exceeded

Hello, I'm doing my first work with metafun to generate a switchgear layout from a cvs file. During the run (texexec ) I get the message - Metapost capacity exceeded and a part of the drawing is missing. I followed the thread -TeX capacity exceeded with metafun- and increased the memory size in texmf.cnf but this is not the solution! Any suggestion what's going wrong? btw. it is allowed to send the tex file to the list? Thanks Thomas