ldap/namingcontext is a SAP Parameter attribute which is used to control Distinguish name of SAP root node for LDAP auto registration information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
You can use this parameter to modify the distinguished name of the SAP
root node in the LDAP directory (X.500 syntax).
If you do not set a value for this parameter, with Microsoft Windows
Active Directory the SAP root node is created in the configuration
naming context below CN=Services.
With other LDAP directories, the "namingcontexts" attribute of the
RootDSE is evaluated and the first value found is used.
CN=SAP is always added. The value should not be set for Microsoft
Windows Active Directory.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.