code: func ConvertWorkItemStorageToModel(wiType *WorkItemType, wi *WorkItemStorage) (*WorkItem, error) {
  	result, err := wiType.ConvertWorkItemStorageToModel(*wi)
  	if err != nil {
  		return nil, errors.NewConversionError(err.Error())
  	}
  	if _, ok := wiType.Fields[SystemCreatedAt]; ok {
  		result.Fields[SystemCreatedAt] = wi.CreatedAt
  	}
  	if _, ok := wiType.Fields[SystemUpdatedAt]; ok {
  		result.Fields[SystemUpdatedAt] = wi.UpdatedAt
  	}
  	if _, ok := wiType.Fields[SystemOrder]; ok {
  		result.Fields[SystemOrder] = wi.ExecutionOrder
  	}
  	if _, ok := wiType.Fields[SystemNumber]; ok {
  		result.Fields[SystemNumber] = wi.Number
  	}
  	return result, nil
  
  }
docs: // ConvertWorkItemStorageToModel convert work item model to app WI