Engineering Change Management in Labeling in PLM Web UI 
You can manage changes by assigning change numbers to label sets in labeling in the PLM Web UI.
Prerequisites
You have set the use of change numbers to mandatory in Customizing activity General Settings, under 
Logistics - General 
Product Lifecycle Management (PLM) PLM Web User
Interface Recipe Development Labeling 
.
Note
You can set change numbers to either mandatory or not allowed in Customizing. This setting is not reversible once you have started creating label sets.
Features
Each label version within an alternative label can have one change number assigned.
If you enable change numbering, the valid-from date of the change number becomes the key date of the label set. The valid-to date then cannot be changed in the first label version, since it is set to infinite. If you create another version, the valid-to date becomes the valid-from date of the next version, minus one day.
Label sets are identified by a key made up of their product specification ID, alternative number, and version number. If you are not using versions, the version number is automatically set to 000.
You can create several alternative label sets for a specification. For an alternative label set you have the option to create several label versions. If you have selected not to use label versions in Customizing, each label set you create becomes a new alternative label.
Each label version can have a status. For more information, see Status Scheme for Label Sets.