Inconsistency btw EMPSTAT and CLASSWKR

USA
1

I am using 1980 5% sample (sample limited to people aged 16-64). I cross-tabulate EMPSTAT and CLASSWKR and found that 87% individuals who reported to be unemployed in EMPSTAT are classified as “works for wages and salaries” in CLASSWKR; Similarly, 2% and 43% who are not in labor force in EMPSTAT are classified (in CLASSWKR) as being self-employed and works for wages. Shouldn’t people who are not in labor force be classified as N/A in CLASSWKR? Thank you!

. tab empstat classwkr ,m nofreq row

                   |     class of worker [general
 employment status |             version]
 [general version] |       n/a  self-empl  works for |     Total
-------------------+---------------------------------+----------
          employed |      0.00       8.41      91.59 |    100.00 
        unemployed |      9.85       3.18      86.98 |    100.00 
not in labor force |     55.00       2.18      42.82 |    100.00 
-------------------+---------------------------------+----------
             Total |     16.44       6.36      77.20 |    100.00
2

The universe of CLASSWKR in the 1980 Census is persons age 16+ who had worked within the past 5 years. So, respondents not working (unemployed or not in labor force) according to EMPSTAT, which references the present time period, still have a response for CLASSWKR if they worked in the past 5 years.