Whether or not an engineering course is BCPM or not can depend.
see p39-40 AMCAS instructions
The department offering the course is typically not a factor in the course classification. For example, a course should be classified as Biology if the primary content is biology, regardless of which department offers the course.
The following guide provides examples of how course are often categorized. Please select course classifications based on the primary content of the course. In the case of interdisciplinary courses, where two or more subject matters are combined into one course, refer to the description of the course on your school’s website or consult with your pre-health advisor to choose the most appropriate course classification.
From Duke premed site
http://prehealth.duke.edu/apply/filling-out-your-application/bcpm-gpa-calculation
If the course content, for example a biomedical engineering course, is 50% or more “Biology” content, then you should classify the course as “Biology” rather than “Engineering”. You should be prepared to provide AMCAS with a syllabus, lecture topics and/or catalog description if you are challenged on your classification during the verification process.