HI,

The documentation tells me that i can create a task object which is related to an custom object by using the WhatID field. Is i creat a task via DML and link it to my custom object ID the insert will fail because of 'Related To: Opportunity/Account ID: id value of incorrect type: a04A000000Bj8wJIAR'. 

Has someone experience with this and is there a way to do this without any custom objects...?

Thanks,

Sten