What is dynalink? When a new form is opened AX sometimes sends along the datasource of the caller even if you have not sent it along with the args. And if you have but do not act upon it AX can filter the datasource in the new form based on selected record in the datasource of the caller.
This is quite a nice help, when wanted that is. When it is not it can be quite a pain if you are not aware of dynalink as it is impossible to understand what happens as this is done behind the scenes.
Here is how you can get rid of it. On the form being called in the init method just add this line
after the call of super method. Likewise, you can add a Dynalink, should you want to, with the addDynalink() method.