A family of Microsoft relational database management systems designed for ease of use.
Why are you using a hyperlink field? You can do this with any text field. If the TaskCode field is on a subform, then your code won't work. You have to use
Where Condition: =[Task Code]=[Forms]![Task Table Edit].subformname.Form.[Task Code]
This would be easier with VBA:
DoCmd.OpenForm "Task Table Edit",,,"[Task Code] = " & Me.[Task Code]
Assuming Task Code is numeric.
BTW, its is not good practice to use spaces in Object names.