I can not add addresses into Global Preferences of DHCP server version
3.13.04 (30 April 2004) running on NW 6 SP5, e-Deirectory version 8.7.3.
Error ENDS603 The requested attribute could not be found.
When trying to do the same from iManger the error is "Unknown error".

I have an urgent need to ensure that DHCP will give addresses only to
known MAC addresses and would appreciate any help.