Cannot display property tree

What causes this issue?

To display a property tree on the screen, its nodes are first read from
a database table. Then the nodes are subjected to an authorization
check that determines whether the user has authorization to display or
change the nodes. This means that at the end of this process, it is
possible that no nodes remain to be displayed.
It is also possible that the nodes were set in Customizing as internal
nodes and are not therefore displayed.
<ZH>Notes:</>
A node can only be displayed if the user has authorization for its
higher-level node and if the higher-level node was also not set as an
internal node.
A subtree in the property tree is only displayed if it contains at
least one leaf. Subtrees that consist of grouping nodes without leaves
are suppressed for the display.

System Response

The property tree is not displayed. However, apart from this, you can
continue to work as usual.

How to fix this error?

Notify your system administrator.

Procedure for System Administrators

Check whether tables TCG51, TCG52, TCG53 contain the required property
tree.
Check whether the property tree contains displayable nodes, that is,
nodes that are not set as internal and are not located beneath an
internal node.
Check which authorizations the user has for the property tree.

Error message extract from SAP system. Copyright SAP SE.