getRelatedRecords Accounts/Campaigns

Hello
It seems it's not possible to retreive Accounts from campaigns...

Is it normal ?

thanks

https://crm.zoho.com/crm/private/json/Accounts/getRelatedRecords?apikey=<apikey>&ticket=<ticket>&newFormat=1&parentModule=Campaigns&id=351877000000279019

{"response": {"uri":"/crm/private/json/Accounts/getRelatedRecords","error": {"code":4401,"message":"Unable to populate data, please check if mandatory value is entered correctly."}}}