The fetched data that appears in blue font signifies that this data is modifiable at the lowest level or cross-sections of dimension members.
The values in the blue font in the image below are examples of the cross-sections of child dimension members. These values can be changed and published back to Cube.
The Revenue and Income values appear in black font as they are parent dimensions and are not publishable. If these values were changed, they would not be included when publishing to Cube. Learn more about which values are excluded from publishes.