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Status Not under consideration
Workspace Planning Analytics
Created by Guest
Created on May 29, 2026

RELATED IDEAS

Support adding dimensions to cubes (default member behavior)

Adding a new dimension to an existing cube introduces a structural change to the cube. As a consequence, all existing reports (PAfE, views, MDX queries, etc.) that reference the cube become invalid and require manual adjustment.
We understand that this behavior is inherent TM1, however, in real-world implementations, business requirements evolve continuously, and the addition of new dimensions is a common scenario as analytical needs grow.

Currently, adding a new dimension:

  • Breaks existing reports and views
  • Requires manual refactoring of formulas (e.g., DBR/DBRW)
  • Impacts MDX queries and rules
  • Introduces significant maintenance effort and risk

This creates a significant barrier to model evolution and discourages extensibility of existing applications.

Proposed Enhancement

Introduce a mechanism to allow backward compatibility when new dimensions are added, similar to the concept available in other OLAP engines.

Specifically:

  • Allow defining a default member for a dimension at the cube level.
  • When a query does not explicitly reference a dimension: Automatically resolve it using the default member

Apply this behavior consistently across:

  • PAfE (Excel reports, DBR/DBRW formulas)
  • MDX queries
  • Cube views

Expected Benefits

  • Enables smoother model evolution without breaking existing assets
  • Significantly reduces maintenance effort after structural changes
  • Improves scalability of Planning Analytics applications
  • Aligns TM1 behavior with modern expectations from BI/OLAP tools
  • Avoids unnecessary rework in Business-as-Usual (BAU) processes
Needed By Quarter
  • Admin
    Stuart King
    Jul 3, 2026

    This idea is not under consideration. Notably, MDX expressions will typically continue to work if some dimensions are not references in the MDX query. Default members are used for each dimension. However, there is no intent to support adding a dimension to a cube as a feature. Rules and TI processes need to be adjusted based on the number of dimensions in the cube.

    This feature would be very complex to implement (requiring changes in both TM1 and clients) and value would be limited to Planning Analytics customers that need to regularly modify the number of dimensions in a cube. This need would be better addressed by model design that includes multiple similar cubes with different combinations of dimensions.

    Reply

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