"ET01E: NO SOURCE MREF TABLE:" - What does this mean and how do I fix it?

Since it is unlikely that you will have IREF and TA tables for every single school in existence, you need to have a "Super Default" table set up to act as a catch-all for those schools where you don't have equivalencies. If you run a plan and get the "ET01E: NO SOURCE MREF TABLE:" error, that means you haven't set up a "Super Default" table.

Setting up the "Super" Default Tables

In order to accommodate courses from schools who you do not have IREF and TA tables set for, a "super" default and TA table should be set up. These will be used for courses that come in with a Source ID that has no match to your tables. You will need to set up the COM.SINSTID and COM.SINSTCD fields to accommodate these tables. This table should be hidden from displaying in the Course Equivalencies (see below).

Note: Make sure the Source Id and FYT/LTY are identical on both your IREF and TA tables.