I have ACBC study with 7 attributes including price. Brand attribute is dropped in BYO. When I mark one brand always as an working option in the first three screening questions, following must-have question does not offer desired brand-level in the list. There is always the same brand-level regardless of previous screening choices. I assumed there would be the level that has been included in all accepted concepts. Also, when I had chosen this brand-level as unacceptable, this level was offered again in further must-have question. What could be a reason for this?
Thanks in advance for a hint