There are a few threads on this error already
<transform> Error when checking composite operator: The number of reject datasets "0" is less than the number of input datasets "1".
Our team has found 2 additional causes.
1) we had a keyword in a link name (in our case the word RAW) which was being found by the C++ compiler as a function call and creating chaos.
2) Link names, or possibly link names AND stage names, were too long. I am unsure of the threshold, but simply shortening my link names cleared the error.
Hope this helps others.
More resolutions for 0 reject datasets transformer error
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