Source Data is mapped when you integrate your data to Cube and create a dimension to map it too. You can check each child dimension for its sources to validate the mapping in two ways:
Let's explore each option.
From the Dimension
If you're looking into an Account in Cube, click into the dimension and see what data source is mapped:
Remember: Parent dimensions act as rollups and will not have mappings; only child dimensions contain mappings.
From Source Data
If you don't see the mapping you expect, go to your Source Data page to see where your data is mapping to:
If the mapping needs to change, you can search and select a different dimension for your data source to map to. If you need to add a new dimension, see how to add one quickly from the mapping page.