code: @RequestMapping(value = "{entityType}/{id}/{propertyTypeName}/edit", method = RequestMethod.DELETE)
      @ResponseStatus(HttpStatus.ACCEPTED)
      public Ack deleteProperty(@PathVariable ProjectEntityType entityType, @PathVariable ID id, @PathVariable String propertyTypeName) {
          return propertyService.deleteProperty(
                  getEntity(entityType, id),
                  propertyTypeName
          );
      }
docs: Deletes the value of a property.
  
  @param entityType       Type of the entity to edit
  @param id               ID of the entity to edit
  @param propertyTypeName Fully qualified name of the property to delete