Aldipalo,
Thanks for the information. My structure is a bit different. I have a patient layout, a visit layout, a medjoin layout, and a layout that lists probably a 1000+ medications. Patients can be on more than one medication and the patient can have more than one visit so this reduces the many to many relationship. Medicines are selected as a pull through and from a drop down list. So my medjoin table only contains the kf_Med# and the kf_Visit#. One date of service is equal to the Visit#. I can't get the previous dates medication portal to display on my current day layout, even with the self join relationship as you suggested.