Understanding Society User Support

Hello,

I have encountered a problem in Stata when using the w_hidp variable. I am currently merging household and individual data from wave 5 onwards. In waves 11 and 12 (k/l), I want to include some COVID-19 specific variables such as w_seiss_reciept_dv. However, when I include them in my code, I receive the error code r(198), 'invalid l_hidp'. If I remove these variables l_hidp works as intended.

Could you let me know of a way to get around this error code as I need to include both these variables in my analysis?

Many thanks,
Mhairi Webster