WIT: Why can't I navigate to lower-level employment groups in a Comparison Table in WIT?

When viewing comparison tables in WIT, you may find that you are unable to drill down into an employment group, even if you know that the bottom-level employment groups are comparable.

Take the below comparison table as an example:

This table is showing the level 2 groups underneath "Adult Social Care and Health". The first two groups cannot be drilled into any further. This could be because they are bottom-level employment groups, in which case, there is no further you can go with it.

However, in this instance, "Early Intervention and Prevention - Adults" has some child employment groups (level 3), each of them having children as well (level 4). The level 4 employment groups have been mapped with the previous survey, but the level 3 groups, which provide a stepping stone between levels 2 and 4, do not have any mappings, so there is no way of getting from level 2 to level 4.

The way to fix this would be to provide mappings for the level 3 employment groups, which can be done using the following Back Office page:

Back Office -> Survey - Processes -> Year-on-Year Employment Group Mapping