1099 NEC

Hi my husband is currently an apprentice for sheet metal workers union.  While he was in school a few weeks of the year he was compensated for his time while in school and received a 1099 NEC for the amount.  When I enter this turbo tax requires business codes which is not provided and I am unsure how to enter this.  Is this an other income?  Or am I complicating this form.  Last year I had my taxes done and it was on a schedule SE form 1040. Can someone help me with this?

      Thank you