Understanding Society User Support

Hi,

The question for this variable jbpen was asked to those who satisfied jbsemp = 1 (currently an employee of a firm).
There are 57,712 responses coded as inapplicable in the dataset. Initially, I assumed that these were for individuals who were self-employed (ie. those who do not satisfy jbsemp = 1) but the numbers don't quite add up. There are only 25,482 responses for those who report being self-employed.

Can I check what these 57,712 responses capture exactly? Would they also include people who are currently unemployed? Which would be the right unemployment variable for me to use to check if this is the case?

Many thanks
Karen