Invalid value in "Level" field for node &1 of property tree &2

What causes this issue?

An incorrect value was entered in the <LS>Level</> field for node &V1&
of tree &V2& in Customizing. A value > 0 must be entered.

How to fix this error?

INCLUDE EHS_NA_ADMIN OBJECT DOKU ID TX

Procedure for System Administrators

INCLUDE EHS_NA_CHECK_CUSTOMIZING OBJECT DOKU ID TX

Error message extract from SAP system. Copyright SAP SE.