Kornel, it seems that something is incorrect in your system because every change you make to the docs files removes the \origin tag
\begin_document
\begin_header
\save_transient_properties true
\begin_document
\begin_header
\save_transient_properties true
+\origin /systemlyxdir/doc/
\textclass scrartcl
\options BCOR8mm,captions=tableheading
\use_default_options false
\textclass scrartcl
\options BCOR8mm,captions=tableheading
\use_default_options false