Can anyone help me with this
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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.
Sorry my bad haven't checked in newer release