The property is changed to a value which is different from last saved value.

Some property changes (For example: Letter input, time input) can be confirmed only after the property input focus is closed after the change. User can click property window space or other property to close input focus, or press "Enter" after input the change.

Property will be forbidden in following situations:
1. The property owner is considered as non-changeable by system. For example: "No Holiday" property in holiday schedule can not be changed.
2. The property is used for display instead of for setup.
3. This property is regarded as meaningless or assigned to a certain value because of other properties
4. When setup multi-owners, one or more than one owners’ property is meaningless or assigned as a certain value.
Property will be hidden in following situations;
1. Invalid owner is selected.
2. The property is forbidden in non-expert mode. To change the mode, click main menu "Platform" -> "Expert Mode".
3. Other properties value leads to meaningless of this property.
4. When setup multi-owners, one or more than one owners’ property is meaningless.

When select multi-owners, different owners may have different values for the same property.