In the standard alphabetic scheme, you can add the following property to identify the characters in the scheme to skip when creating a new revision label:

where <list> is the list of characters to exclude. Do not use a separator in the list.

By adding this property, the characters in the list can be in existing revision labels, but are used when a new revision label is defined. For example, assume the following property is set:

Then the next revision character used for an existing object with the current revision label of A.H is A.J (and not A.I). Also, existing objects with the current revision label of A.I will use A.J as the next revision label.