import OSM to Postgres (osm2psql) missing objects form "rel" table

Hi there. I'm looking for someone familiar with osm import and configuration of import process. For the import data I use osm2psql command. At the end of the proces I have standard tables: plant_osm_line, planet_osm_point and planet_osm_polygon, but I see some missing objects - like Sahara desert. In source tables contain such data - I can find it in planet_osm_rels. I have to have load missing data (even with some errors) to mentioned 3 tables. If you know what to fix this let me know.