code: public void removeRelationship(ExtendedRelation extendedRelation) {
  
  		try {
  			if (extendedRelationsDao.isTableExists()) {
  				geoPackage.deleteTable(extendedRelation.getMappingTableName());
  				extendedRelationsDao.delete(extendedRelation);
  			}
  		} catch (SQLException e) {
  			throw new GeoPackageException("Failed to remove relationship '"
  					+ extendedRelation.getRelationName() + "' between "
  					+ extendedRelation.getBaseTableName() + " and "
  					+ extendedRelation.getRelatedTableName()
  					+ " with mapping table "
  					+ extendedRelation.getMappingTableName(), e);
  		}
  	}
docs: Remove a specific relationship from the GeoPackage
  
  @param extendedRelation
  extended relation