I am currently facing a challenge in developing an accordion-style widget for a hierarchical data structure in OutSystems. The data model involves a self-referencing relationship within an entity named "Topic," with an attribute called "ParentTopicId" representing the hierarchical link.

This image is what I need to build with OutSystems, "limit5" is the parent of "limit6" and so on.

Requirements:

• Display a list of topics in an accordion format.
• Topics without a parent should appear at the highest level.
• Each topic may have child topics, and this hierarchy can extend to multiple levels.

Specific Challenges:

• Front-End Rendering: Difficulty in structuring the front-end to represent the hierarchical data in an accordion layout.
• Data Retrieval: Ensuring proper data retrieval from the "Topic" entity, organized by the "ParentTopicId" to maintain the hierarchy.