OK, I solved it myself, it was related to the .ytyp file. In the archetype definition, I wasn’t setting the physicsDictionary right. Now it works with the following conf :

<Item type="CBaseArchetypeDef">
      <lodDist value="50.00000000"/>
      <flags value="549584896"/>
      <specialAttribute value="0"/>
      <bbMin x="-0.40000000" y="-0.20000000" z="-0.80000000"/>
      <bbMax x="0.40000000" y="0.20000000" z="0.80000000"/>
      <bsCentre x="0.00000000" y="0.00000000" z="0.00000000"/>
      <bsRadius value="1.68020000"/>
      <hdTextureDist value="5.00000000"/>
      <name>gb_hosp_basin01</name>
      <textureDictionary>gb_hosp</textureDictionary>
      <clipDictionary/>
      <drawableDictionary/>
      <physicsDictionary>prop_gb_hosp_basin01</physicsDictionary>
      <assetType>ASSET_TYPE_DRAWABLE</assetType>
      <assetName>gb_hosp_basin01</assetName>
      <extensions/>
    </Item>
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