Compare please two SMath-sheets in attach Transport-cd.sm(18 KiB) downloaded 58 time(s). - money cd Transport-error.sm(18 KiB) downloaded 59 time(s). - money - ¤ Is it an error?
I think the issue is that the you are trying to use the Boolean exclusive or as unit symbol, and this conflicts in some way; I think it shouldn't, as it is on the RHS of the unit symbol, still the root cause might be that.
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