Dear there, 

here is my source level relationship: 

1) in section A, i add "Embedded Section" section B in it

2) in section B, i add a "Dynamic Layout" and put a text input UI control(name it TxtInput) into the Dynamic Layout

you can refer attachment "info.png" for better understanding.

i'm very confused on following 2 different settings: 

Setting A:

A1) set "Presentation->Edit options->Read Only(When Rule)" of Embedded Section(references to Section B) to a When rule "Never"

A2) set the "Presentation->Edit options(Condition for read-only)" of text input UI control "TxtInput" in section B to a When rule which always return True.

The result is that the input text indeed can only readonly. 

Setting B:

A1) set "Presentation->Edit options->Read Only(When Rule)" of Embedded Section(references to Section B) to a When rule "Always"

A2) set the "Presentation->Edit options(Condition for read-only)" of text input UI control "TxtInput" in section B to a When rule which always return False.

My supposed result is that the Text input should be editable, but the result is readonly. 

here is my question:

why in setting A, the when rule on input text control will work, but in setting B, the when rule on the text input control does not work?