...
In ProStructure, Change only refers to the maintenance of the header data of the structure relationship. Maintenance of the target structure of a changing structure relationship is dealt with in Editing the Target Structure.
Depending on the type, you can only maintain a small amount of data in the structure relationship, since most data is of a controlling nature and a change to this would result in inconsistent structure data.
You can change the name and authorization group for both types at any time.
For comparative structure relationships, you can change the type to "Reconciliation and actions on target structure". When you save, the same checks are made as described under Creation of a Structure Relation.
For comparative structure relationships, you can change the validity of the reference and the target.
For changing structure relationships, you can change the validity of the target, but only if the changes are not yet applied. After applying, the used validity must be reset first (see below “Reset target validity”).
Deactivate/activate relationship
...
Checks when you create a structure relation (Creation of a Structure Relation)
Set Stop automatically
Prevention of Direct Maintenance of Standard SAP ObjectObjects
It is possible to reactivate a structure relationship. However, only if the corresponding target structure with the set validity is not in process in another active structure relationship. When you activate a deactivated structure relationship, it is set back to the status before deactivation.
...