code: public MyEntitiesValidationReport addEntity(String entityTypeId, boolean importable) {
      sheetsImportable.put(entityTypeId, importable);
      valid = valid && importable;
      if (importable) {
        fieldsImportable.put(entityTypeId, new ArrayList<>());
        fieldsUnknown.put(entityTypeId, new ArrayList<>());
        fieldsRequired.put(entityTypeId, new ArrayList<>());
        fieldsAvailable.put(entityTypeId, new ArrayList<>());
        importOrder.add(entityTypeId);
      }
      return this;
    }
docs: Creates a new report, with an entity added to it.
  
  @param entityTypeId name of the entity
  @param importable true if the entity is importable
  @return this report