Thank you bharder! Thru your remark I was finally able to spot the bug, but I don't have an idea, how to solve it!

In the archive there is a file <samp>Manifest</samp>. Now Fossil want to create an own file <samp>manifest</samp> where it stores some information. Unfortunately the MacOS/X' filesystem HFS+ is case insensitive per default! So the checkin's file <samp>Manifest</samp> and Fossil's own one <samp>manifest</samp> are considered the same. So after checkin, Fossil write its <samp>manifest</samp> thereby destroying a file that is part of the checkin! Fossil detect that and complain.

As Fossil do not need a file <samp>manifest</samp> (i.e. it can work without one), it should be taken into consideration, whether it should be possible to prevent the creation of the <samp>manifest</samp> and <samp>manifest.uuid</samp> files per default?

Ciao,
:-)