Validate Facebook work position targeting IDs

Our Facebook Ad system uses work position in its targeting spec as documented here: http://ift.tt/1H6mbII

Sometimes Facebook deletes existing work positions and API requests to update the targeting spec fails:

{
    "error":
    {
        "message": "Invalid parameter",
        "type": "FacebookApiException",
        "code": 100,
        "error_subcode": 1487079,
        "is_transient": false,
        "error_user_title": "Invalid Targeting Spec",
        "error_user_msg": "The specified targeting spec is not valid because: Job Titles with id 1542119359378854 is invalid."
    }
}

The same happens with interest, but there is an API request to validate interests: http://ift.tt/1H6mcMV

Is there something similar for work positions? (Probably undocumented?)

I could do requests to the /search/ API endpoint, but then I'd run into API request limits.