NOTCAT 2-GS is an MVS message that shows a duplicate catalog entry exists. E.g., if we already have a dataset with dsn = 'xxxx.yyyy' and we want to create one with disp new, catlg, we would get this error.
When the program opens and write, it will go through, and at the end of the step, the system would try to put it in the system catalog. At this point, as we have an entry which already exists, the catlg would fail and give this message.
We can fix the problem by deleting the first data set and going to the volume where the new dataset exists and cataloging it.
