Hi Markus,I was able to reproduce the problem. Although Word displays it correctly at first, as soon as you double-click on the graph to begin editing in Origin, the legend is redrawn and displays the column name instead of the column label.
The problem has to do with the substitution notation used in the legend. It will be addressed by our development group. For now you will need to choose from the two possibilities that you mention as work arounds.
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Microcal Technical Support