How to maintain entries in tables T894 & T881

Hi Friends,

As per note 64034 I need to maintain few entries in T894 & T881 table. But could not get where will be the customization path to maintian these entries. These entries were available in 4.7 version and few entries are missing after upgrading to ECC 6.0.

Please let me know, where can we maintian entries for these tables through customizaton.

Regards

Suresh