Can anyone help me with this
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Its strange. Two things to check
1. What are the components you have inside the collapsed pane layout.
2. What version of Appian are you in?
Also try adding an empty pane layout inside the contents and see it if errors out too.
It's not gonna accept. Because both are outer shells, Clearly mentioned in the documentation below .
https://docs.appian.com/suite/help/24.1/Pane_Layout.html#panes-as-a-top-level-layout
Thats why I was asking for the version of Appian. As the documentation for 24.3 clearly suggests pane layout can be used in the contents parameter of a header content layout to display a pane layout with a header
docs.appian.com/.../Pane_Layout.html
In older versions too it's not gonna accept Panelayout because it's a top level layout
It can be achieved in 24.3
My Appian version is 24.2.295.0.
In the new update, it will accept.
Sorry my bad haven't checked in newer release
From 24.3 version, pane layout is supported within header content layouts. Please see the release note for reference:
https://docs.appian.com/suite/help/24.3/Appian_Release_Notes.html#interfaces
24.3 onwards, it will work.