Setting Restrictions on Layout Containers 
You can modify the provided Web Page Composer layouts so that page authors can only drag specified content templates onto a given container.
Note
The restrictions defined here are not relevant for accessible users working in Accessible Area Management.
You are assigned to the Content Administrator role
In the portal, go to .
In the Portal Catalog, open .
Select the layout on which you want to set restrictions and in the context menu of the layout choose .
In the Properties editor, choose All to display all of the layout's properties.
In the Layout XML Template property, add the following tag directly after the TableCellData tag for each container to which you want to add restrictions:
ContainerBehaviors allowedDropTags=”<template name>”
<template name> is the value of the com.sap.portal.ContentTemplate property in the content template. You can find the content templates in .
Note
The value of the Layout XML Template property cannot contain structured XML. Make sure that the value contains a single line of text.