Activity Links Section on the Activity Details Page

The Activity Links section on the main Activity Details page shows the existing links for an activity. The section can be read-only or editable depending on the permissions set for your user type.

If the linked activity is assigned to the current user or to a resource who's visible to the user, the identifiers of the linked activities serve as a link. Upon clicking the link, the details of the corresponding activity are displayed. In offline mode, the identifier is a link, only if the linked activity is assigned to the current resource. If not, the activity identifier is displayed just as a text. The color of the icon before the identifier is based on the status of the activity, and uses a similar color-coding convention from the Activity Type configuration.

If a link constraint is violated, a warning message is displayed below the linked activity.

Warnings are displayed in these scenarios:

If the link is Start-to-start and the second activity has already started when the first activity hasn't yet been started.
If the link is Start-to-start or Finish-to-start, and the first activity has been canceled.
If the link is Finish-to-start and the second activity has already started when the first activity hasn't yet been completed.
If the activities are scheduled in a way that the link condition may not be met. For example, if the first activity has been scheduled to start after the second activity.
If the activities are supposed to start simultaneously, but there's a gap of more than one hour between their scheduled start time.
If the activities are supposed to start simultaneously and only one of them has started while the other hasn't started.

In addition to warnings, you can also see informational text. It is displayed if the current activity can't be started until an action is taken on the linked activity. The informational text lets you know that the current activity can't be started yet.

The informational text is displayed in these scenarios:

If the link is Start-to-start and the first activity hasn't started yet.
If the link is Finish-to-start and the first activity hasn't been completed yet.

If the 'Activity Links' section has a visibility condition of Read-Write, the section is displayed the same way it's displayed for Read-Only; the only difference is that the title of the section is a link.

Clicking the 'Activity Links' title takes you to the existing activity links page, where you can add new activity links or change existing ones.

Activity Links for Segmentable Activities

For segmentable activities, the details about the other segments aren’t shown in the 'Activity Links' predefined section.
If the activity link is Start to start, the first segment of the segmentable activity is linked to the other activity. The other segments won't show the linked activity.
If the activity link is finish to start where the segmentable activity is the first activity, the last segment of it is linked to the normal activity. The other segments won't show the linked activity.
If the activity link is Finish to start where the segmentable activity is the second activity, the first activity is linked to first segment of the segmentable activity. The other segments won't show the linked activity.
If the activity link is to Start simultaneously, the first segment of the segmentable activity is linked to the other activity. The other segments won't show the linked activity.
If the activities are just related, the first segment of the segmentable activity is linked to the other activity. The other segments won't show the linked activity.
These statements hold true even when a segmentable activity is linked to another segmentable activity.