[Driver Measure]!==BLANK.
By configuring Allow Input – Based on Formula, cells that don't satisfy the specified condition are automatically locked. This ensures that users can only allocate across dimension intersections that meet the defined driver criteria (for example, where the reference measure is nonblank).
A regular measure pulls a value directly from the semantic model or a planning sheet at whatever granularity it exists. A Cube measure is a calculated allocation layer - it takes a measure with limited granularity and distributes it across additional dimensions using a reference measure as the basis for distribution, without altering the source data.
Yes - you can add multiple breakdowns, which are useful when you need to segregate planning into groups such as geography, category, or customer type. However, all breakdowns must have a common dimension.
No - the base measure only populates the cube measure at the point when it is created. After that, the cube measure becomes its own independent editable series. A later change to the base measure would not retroactively update the cube - the two are no longer linked once the copy is made.
The values would not populate. Without the Cube breakdown, Infobridge has no way to resolve the measure at the additional dimensions - it can only read the measure at the grain at which it was created. This is the core problem Cube Measures solves.
The update is applied to the subtotal, and the cube breakdown distributes that change proportionally down to every dimension category combination under the subtotal, based on their share of the reference measure.
Inserting it specifically as a Cube measure is what preserves its two-way behavior. If it were pulled in as a regular read-only reference, the consuming sheet would only display the value - it can't be edited there. Inserting it through Cube Measures keeps the breakdown-based link intact, so an edit on the consumer flows back to the origin just as an edit on the origin flows forward to the consumer.