I attempted to sign up for a study, and I was prevented from doing so because the study I was trying to sign up for is a disqualifier for another study I am scheduled to participate in. Why is this?

If you have signed up for a study that has disqualifiers (studies you must not have participated in to participate in that study), you may not sign up for the studies that are listed as the disqualifier studies. You are allowed to sign up for the disqualifier studies if the disqualifier study will take place after the study with disqualifiers. You are also allowed to sign up if you have already participated in (and received credit for) the study with disqualifiers. The easiest way to sign up for both studies is to schedule the disqualifier study at a time later than the study with disqualifiers. 

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SONA