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Changes between Initial Version and Version 1 of Ticket #6003, comment 2

initial	v1
1	1	The basic problem is that `MpxIndex.y` has no initial value and needs to be determined during intialization. The algorithm is not smart enough to figure out by itself that it needs to be fixed (this is a heuristic so you need to help it a little bit).
2	2
3		Since you already provided a start value for this discrete value you seem to know what it should like at the start. Just fix it with `fixed=true` and everything works fine.
	3	Since you already provided a start value for this discrete value you seem to know what it should look like at the start. Just fix it with `fixed=true` and everything works fine.
4	4
5	5	In general: each state and each discrete variable needs to have either a fixed start value or an initial equation (which does not necessarily have to contain it, e.g. steady state initialization `der(x) = 0.0`. it just to be logically connected). I would not rely on the tool to figure out these things on its own, that can be weird sometimes.