Dependency Types Reference - Nextedy Documentation

Mapping advanced dependency types (SS, FF, SF) to Polarion link roles requires Gantt version 4.4.0 or later. (Advanced dependency link types were first introduced in 3.0.0.) Earlier versions only support Finish-to-Start.

Dependency Type Codes

Code	Type	Name	Constraint
`0`	`finish_to_start`	Finish-to-Start (FS)	Target task cannot start before source task ends (may start later)
`1`	`start_to_start`	Start-to-Start (SS)	Target task cannot start until source task starts (may start later)
`2`	`finish_to_finish`	Finish-to-Finish (FF)	Target task cannot end before source task ends (may end later)
`3`	`start_to_finish`	Start-to-Finish (SF)	Target task cannot end before source task starts (may end later)

Dependency Link Properties

Each dependency link in the Gantt chart carries the following properties:

Property	Type	Default	Description
`id`	String	Generated	Unique identifier derived from the Polarion link role and connected work item IDs
`source`	String	Required	ID of the predecessor (source) task in the dependency
`target`	String	Required	ID of the successor (target) task in the dependency
`type`	String	`0` (FS)	Dependency type code: `0`=FS, `1`=SS, `2`=FF, `3`=SF
`roleId`	String	See application	The Polarion link role ID used for this dependency link (e.g. `dependson`)
`roleName`	String	See application	Human-readable name of the Polarion link role (e.g. “depends on”)
`lag`	Integer	`0`	Lag time in days (positive) or lead time (negative) applied to the dependency

Dependency Type Visual Reference

Enabling Advanced Dependency Types

By default, only Finish-to-Start (0) dependency links are supported. To enable all four types, set the following configuration property:

nextedy.gantt.default.advanced_dependencies=true

Set this property in Project / Repository Administration > Configuration Properties.

When using advanced dependency types, the Gantt stores metadata in a custom field called gantt_dependency_metadata. Hide this field from end users in the Polarion Form Configuration.

The Dependency Role widget parameter controls which Polarion work item link roles represent dependency relationships. Configure this under Widget Properties > Work Items > Dependency Roles.

Setting	Description
Empty	No dependency links are shown
Single role selected	All dependency links use this role
Multiple roles selected	The first role is used when creating new dependency links via drag

Link Role Mapping per Dependency Type

You can optionally map each dependency type to a different Polarion link role by adding these configuration properties:

nextedy.gantt.workitems.linkRoles.finish_to_start=your_FS_role_id
nextedy.gantt.workitems.linkRoles.start_to_start=your_SS_role_id
nextedy.gantt.workitems.linkRoles.finish_to_finish=your_FF_role_id
nextedy.gantt.workitems.linkRoles.start_to_finish=your_SF_role_id

Multiple link roles per dependency type are supported as comma-separated values:

nextedy.gantt.workitems.linkRoles.finish_to_finish=dependency_feature_ff,dependency_task_ff

Link Direction

By default, the Gantt reverses the arrow direction to match standard Gantt chart conventions (source points to dependent item). If your Polarion link role already points from source to dependent, set the forward dependency property:

nextedy.gantt.workitems.default.forward_dependency=true

Disabling Dependency Link Creation

To prevent users from creating dependency links by dragging, add this to the Gantt Config Script widget parameter:

gantt.config.drag_links = false;

Constraint Violation Indicators

When a dependency constraint is violated (for example, a target task is scheduled before its source finishes in a Finish-to-Start relationship), the Gantt displays a red dotted line under the incorrectly positioned task bar. Move the task to comply with the dependency rules to resolve the violation.

When auto-scheduling is enabled, the Gantt automatically recalculates task dates based on dependency constraints. Dependency links that are hidden or not loaded due to limits are ignored by the scheduling engine.

Lag and Lead Time

Each dependency link supports a lag property:

Value	Effect
Positive integer (e.g. `2`)	Delays the successor by the specified number of days after the dependency constraint
`0`	No lag (default)
Negative integer (e.g. `-1`)	Creates lead time, allowing the successor to begin before the dependency constraint

Create Your First Dependency Link — step-by-step tutorial
Work Items Gantt Widget Parameters — Dependency Role parameter
General Administration Properties — advanced dependency properties
Gantt Config Script API — drag_links and other config overrides

​Dependency Type Codes

​Dependency Link Properties

​Dependency Type Visual Reference

​Enabling Advanced Dependency Types

​Dependency Role Widget Parameter

​Link Role Mapping per Dependency Type

​Link Direction

​Disabling Dependency Link Creation

​Constraint Violation Indicators

​Lag and Lead Time

​Related Pages

Dependency Type Codes

Dependency Link Properties

Dependency Type Visual Reference

Enabling Advanced Dependency Types

Dependency Role Widget Parameter

Link Role Mapping per Dependency Type

Link Direction

Disabling Dependency Link Creation

Constraint Violation Indicators

Lag and Lead Time

Related Pages