In the file with generated longitudinal data on children (KIDLONG) in SOEP-Core v31.1 another correction had to be implemented: Some few data that only had been asked in the FiD study were missing.
This applies to the variables KA06$$ (Activities for children below the age of 6) and KA16$$ (Activities for children aged 6 to 16).
If you want to analyze these variables there are three ways to use the corrected data: