Accuracy spec. includes gain and offset error.
Gain error is always in % relative to the measured value.
Offset is an absolute error and can be specified either in % of the range or in digits.
It is of course not really an option to "measure" at the edge of the resolution, but just for fun let's calculate the specified error for 0.1A in the 200.0A range:
Gain error = +/-2% x 0.1A = +/-0.002A;
Offset error = +/-5 counts/digits = +/-0.5A; (since there are +/-2000 counts, it could also be specified as +/-0.25% of the range)
Total error = +/-0.5002A;
As can be seen, the gain error becomes negligible here and any display from -000.5A to +000.5A would still be in spec.