I have seen many times that, say for an example, if I write
-A+B-C+D=0; the process aborts with an error, saying that one of the nodes missing Degrees of Freedom.
On the contrary, if I write -B+A-D+C=0; which is basically changing the side, works ok. Is there any specific explanation for such behavior?
In Abaqus/Standard the first nodal variable specified in an equation constraint will be eliminated to impose the constraint; therefore, it should not be used to apply boundary conditions, nor should it be used in any subsequent multi-point constraint, kinematic coupling constraint, tie constraint, or equation constraint. E.g., in your 1st equation, the nodal variable A will be eliminated, while for the 2nd eqn, B will be eliminated. So if later on you try to apply a BC or equation constraint to A in the 1st case, Abaqus will throw an error. Please read more on this at the Abaqus documentation in the following link. Regards.
https://help.3ds.com/2018/english/DSSIMULIA_Established/SIMACAECSTRefMap/simacst-c-equation.htm?ContextScope=all&id=9697cc2d24a2461f8b958d39609ca772#Pg0
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