i tried to dissolve two polygons(brown and the yellow marked polygons) of one layer that own some en-/exclaves in QGIS (first union both, then dissolve the union-polygon).
But dissolving dose not work :(. I don't get an error but it dissolved only one polygon an the other one is not included. There are also other polygons without enclaves and it works perfect.
The data I used is opendata (http://www.geodatenzentrum.de/geodaten/gdz_rahmen.gdz_div?gdz_spr=deu&gdz_akt_zeile=5&gdz_anz_zeile=1&gdz_unt_zeile=13&gdz_user_id=0, -> UTM32, Ebenen, ArcInfo-SHAPE). The polygons are NUTS DE124 and DE128 from file vg250_KRS.
Is there any way to dissolve these enclave-polygons with those other "normal" polygons in QGIS (I also tried the editor but it does not help)?