Theme for self created vector map cannot be selected
I've sucessfully created a simple map of few elements from OSM data with OSMOSIS (Version 0.47) and the MAPSFORGE map-writer (Ver 0.10.0).
To test the maps, different definition files (tag-mapping_xxx.xml) were used to select the OSM-tags.
All these external maps are loaded and displayed in LOCUS with different design.
For these maps the Theme cannot be switched, as only the internal general theme can be selected in LOCUS.
What's the error and how can it be fixed?