magento2: Property "children" does not have setter in class Magento\Catalog\Api\Data\CategoryInterface

“children” field should not be included in documentation ( http://devdocs.magento.com/swagger/index_21.html ) of possible body of POST /V1/categories in catalogCategoryRepositoryV1 or it should be ignored in webservice itself.

The same applies to documentation of body of PUT /V1/categories/{id} webservice.

Preconditions

1. Magento 2.1.7

Steps to reproduce

1. Create POST request to /rest/V1/categories endpoint with body:

{   
	"category": {
		"is_active": true, 
		"name": "Test",     
		"children": "1"   
	} 
}

Expected result

1. Category is created

Actual result

1. {“message”:“Internal Error. Details are available in Magento log file. Report ID: webapi-xxxxx”}

Exception log:

Next Exception: Report ID: webapi-5953d753666e8; Message: Property "Children" does not have corresponding setter in class "Magento\Catalog\Api\Data\CategoryInterface". in /var/www/vendor/magento/framework/Webapi/ErrorProcessor.php:195
Stack trace:
#0 /var/www/vendor/magento/framework/Webapi/ErrorProcessor.php(139): Magento\Framework\Webapi\ErrorProcessor->_critical(Object(LogicException))
#1 /var/www/vendor/magento/module-webapi/Controller/Rest.php(219): Magento\Framework\Webapi\ErrorProcessor->maskException(Object(LogicException))
#2 /var/www/vendor/magento/framework/Interception/Interceptor.php(146): Magento\Webapi\Controller\Rest->dispatch(Object(Magento\Framework\App\Request\Http))
#3 /var/www/var/generation/Magento/Webapi/Controller/Rest/Interceptor.php(39): Magento\Webapi\Controller\Rest\Interceptor->___callPlugins('dispatch', Array, Array)
#4 /var/www/vendor/magento/framework/App/Http.php(135): Magento\Webapi\Controller\Rest\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
#5 /var/www/vendor/magento/framework/App/Bootstrap.php(258): Magento\Framework\App\Http->launch()
#6 /var/www/pub/index.php(37): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#7 {main} [] []