Dissolve polygons

Hello,

I need to do a simple operation in any GIS software, like QGIS, but I can't replay it in FME, and then load this data on ArcGIS Server.

For example, I have two polygons with the same code (two rown in a data base) and I need to fusion them into a single one, using a common attribute, the code. The result would be two geometries and only one row into database. 

If I use Aggregator transformer, checking group by this attribute, apparently the result is ok, but output a geometry collection don't load to ArcGIS Server. I tried to use GeometryCoercer, after the output port of Aggregator transformer, but it didn't work. 

So, can someone help me?

Thanks!