MAX() and MAX() OVER PARTITION BY produces error 3504 in Teradata Query

Question

I am trying to produce a results table with the last completed course date for each course code, as well as the last completed course code overall for each employee. Below is my

Answer 1

SELECT employee_number, course_code, MAX(course_completion_date) AS max_date
FROM employee_course_completion
WHERE course_code IN ('M910303', 'M91301R', 'M91301P')
GROUP BY employee_number, course_code