I have came across a problem with loading some Microstation drawings in ArcGIS 10.3. The problem is that some lines are marked as Complex Multiline. During run of the CAD to Geodatabase tool, it throws an exception that the value 'Complex Multiline' could not be written into Entity field. That is right beacuse the field length is only 16 and the text has 17 characters. I would like to report it as a bug. Can you confirm, that it already is registered or resolved in 10.3.1? Thank you.
P.S.: Since I had a bunch of such a drawings, that needed to be imported into GDB, I had to deal with it somehow: The workaround was to separate the import process to Import CAD Annotation tool for annotations and using Create Feature Class with template that has the Entity field set to e.g. 20 and then using the Append to load Polyline data from drawings. I can share the Python code if anyone is interested.