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 not 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 H is J (and not I). Also, existing objects with the current revision label of I will use J as the next revision label.