Thanks, Martin, this tip worked for my problem. Just to recap: 1. Use the "+d=optdaedump" debugging switch to omc.
2. Take the output and find the table called "Transpose Incidence Matrix". 3. Find all empty rows in that matrix and note their row numbers. 4. Find the table called "Variables", and look up those numbers. That gives you the names of the variables "missing" equations. Yes, this should definitely be encapsulated in a built-in tool, to generate a more useful error message. Bill
