Hi Siemens,
most of the lines can have a style assigned.
Center line on the other hand has only Color and Width... and incorect style. It basicaly a version of dashed line. Which can look like invisible line, thats scale dependant. What it should (must, if one has to obey the standard) be is long dash dot long dash line.
Siemens, please fix it.
p.s. I don't have first level support so don't bring up that support system, thanks.