Making All Forms Available To VBA

Good evening,

I am trying to use VBA to address a field in three different subforms on a form. When I am in the VBA environment writing the code, I noticed that only two of the subforms are listed in the Project window on the upper left. I ignored that and wrote the code anyway, and when I execute the code, it works fine for the two subforms in the Project window, but when it gets to the third subform, it throws this error:

"MS Office Access can't find the field '|' referred to in your expression."

The code is this:
Private Sub Test_Number_AfterUpdate()
[Form_Consumables Entry].Test_Number.DefaultValue = [Form_Test Director Panel].Test_Number.Value
[Form_Squawk Entry].Test_Number.DefaultValue = [Form_Test Director Panel].Test_Number.Value
[Form_Event Log Entry].Test_Number.Value = [Form_Test Director Panel].Test_Number.Value
End Sub

Can anyone tell me how to make all of my forms available to VBA?

Thanks!
Erik