Increase the Major_Rev / Revision sequence.

Found it. There is an Itemtype Revisions on the TOC, you open that up and edit it.

Could you be more specific? I noticed that major version currently maxes out at Z. I cannot make a revision like AB, AC, AD, etc..

Append to the list. 

ex: a b c ... z aa ab ac ad  and so on 

Sorry, I am newbie. Do I have to change the source code or it something that can be done through web access?

Log into Innovator with Admin rights
Under the TOC expand Administrator
Find the Revision Itemtype (if you don't see it you will have to add it to the TOC)
Search Revisions (Should bring up 'Default')
Open and Edit 'Default' Itemtype
In the 'Revisions' textbox append to the list of existing revision numbers that you wish to have.
Save Lock and Close

Should now be able to revision past 'Z'

Log into Innovator with Admin rights
Under the TOC expand Administrator
Find the Revision Itemtype (if you don't see it you will have to add it to the TOC)
Search Revisions (Should bring up 'Default')
Open and Edit 'Default' Itemtype
In the 'Revisions' textbox append to the list of existing revision numbers that you wish to have.
Save Lock and Close

Should now be able to revision past 'Z'

Thank you very much!!!!!!