Change propagation updates are pending (1 job estimated) and it is recommended to wait with modifications to a property until the process has been finalized to prevent intermediary interruptions or contradictory specifications.
"Allows value" is a predefined property that can define a list of permissible values to restrict value assignments for a property and is provided by Semantic MediaWiki. This property is pre-deployed (also known as special property) and comes with additional administrative privileges but can be used just like any other user-defined property.