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