Thank you very much ballardw and data_null for your reply. I have done a few test to try to figure out what the problem is, now I seem to have a clue but not a solution. In my both of my DATA = INPUT and SCORE=PARAMETERS dataset, there are BY group - A, B, C, D, and some other variables not in the BY groups. This BY group can have many combination based on the possible values of these four variables. In the log I can see that the error only complains about the BY group combination that exist in SCORE but not in DATA. If I expand the DATA dataset with some fake numbers just to make it have exactly the same BY group combination as in SCORE, it works fine. So it doesn't seem to do with the length of variables. I thought as long as all the BY group combination in DATA also appear in SCORE dataset, this should be fine, at least it is the case in my old SAS. And the SAS document also doesn't mention the two has to be the same. Any idea why it is like this? Thank you so much!
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