Adding fields to the Additional Info Tab

Hi,

We have a requirement to add fields on the additional infor tab. There are 6 tabs namely 'General Information', 'Additional Information', 'Financial Information', 'Capacity Information', 'Authorization' and 'Notes'.

The 'General Information' and 'Financial Information' tabs are seen in the customizing.

Could someone clarify how to add fields in the 'Additional Information' tab. After making changes in the customizing the 'Additional Information' tab has diseappeared. Can someone mention hoe to see it back.

I have cleared the cache and restarted, but doesn't help as of now.

Regards,

Dirk