Sub Form problem

[sk88]

I have a form named “audit”
A subform in audit called “audit_sub”


Then I have another subform within the subform “audit_sub” called “audit_sub_sub”
The users will be filling out the both the subforms.
But the subform “audit_sub_sub” has a function where the user can click ADD NEW (just for this particular form)
It works fine when the form is working on its own but when I linked to the main form “AUDIT” it says Run-Time '2489': The object ' audit_sub_sub ' isn't open.

How do I solve this? I read online that I would need to setfocus the sub form but I can’t seem to get it right as I am not an expert in Access.
Please Help

[RuralGuy]

Perhaps this link will help: http://access.mvps.org/access/forms/frm0031.htm

[sk88]

Perhaps this link will help: http://access.mvps.org/access/forms/frm0031.htm

Thanks RuralGuy