Displaying area in hectare while it should be square kilometer

[naoliv]

Using the attached example file, select the outer riverbank and you see it properly measured as square kilometer.
Now select any of the inner polygons and you get the area in hectare (ha).

Both measurements should display the area in Km²

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2014-09-16 01:33:52
Last Changed Author: Don-vip
Revision: 7543
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Relative URL: ^/trunk
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2014-09-16 03:29:51 +0200 (Tue, 16 Sep 2014)
Last Changed Rev: 7543

Identification: JOSM/1.5 (7543 pt_BR) Linux Debian GNU/Linux unstable (sid)
Memory Usage: 247 MB / 4029 MB (115 MB allocated, but free)
Java version: 1.7.0_65, Oracle Corporation, OpenJDK 64-Bit Server VM
Java package: openjdk-7-jre:amd64-7u65-2.5.2-3
VM arguments: [-Dawt.useSystemAAFontSettings=on]
Dataset consistency test: No problems found

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- SimplifyArea (30624)
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- editgpx (30634)
- geotools (30569)
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- jts (30416)
- measurement (30641)
- merge-overlap (30416)
- notes (v0.9.4)
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- utilsplugin2 (30460)