PRIV mode due to async. RFC

Since a mates of days we person the occupation that aft calling a async. RFC from 1 SAPGUI dialog process, this process times retired aft 2 minutes with the connection "Process has been reset from PRIV mode aft timeout". The called process exists further. The calling process itself does not usage a batch of representation astatine all. There is nary crushed wherefore it should spell into PRIV mode. In SM50 nary PRIV mode is displayed for the process.

Why does an async. RFC acceptable the calling process into PRIV mode? 

Thx. ,

Thomas