After cume and favorite station choices are made, the interviewer will ask the respondent about Ethnicity. If your station has decided to Don't Ask Ethnicity (Set Recruitment Quotas), then you will not see this question, and you will immediately go to the Demographics question.
If a respondent is from an Ethnic group that you are not allowing to be tested this week, they will not immediately be disqualified. The interviewer will proceed to ask the demographic question, and check the gender box before they are told the respondent does not qualify due to ethnicity. This will relieve your interviewers of having to explain your ethnic recruiting policies to respondents that would otherwise be immediately rejected due to their response to the ethnicity question.