converting multiple relations into 1 polygon

update: fixed

Hi there,

I'm trying to merge multiple relations into one polygon area.

What i did:

In JOSM:

1. File->Download an object, choose the type "relation" and give the id, uncheck "Download referents" and check "Download members"
2. remove all admin-centres
3. remove all tags in the tags/members column
4. removed all inner ways (with lasso tool/select tool)
5. fix: copy-pasted all to a new layer (CMD-A, CMD-C, CMD-ALT-V)
6. merged ways with (C) and preserve all ways
7. Save as .osm
8. Use osm2poly.pl script for generate the poly file : perl osm2poly.pl data.osm > data.poly

But then i get multiple polylines. How can i merge these relations?

Add. I based my actions on https://help.openstreetmap.org/questions/15481/converting-a-relation-into-an-osmosis-polygon-file

Regards, Ed'