The warnings mean that those character variables do not have the same length in every dataset. SAS uses the variable lengths from the first dataset, so if subsequent datasets specify a longer length, values may be truncated. You may circumvent this problem by specifying a length for those variables as the first statement in the datastep (before the set statement). The note usually results from a string that cannot be translated into a number with the requested informat. You can make SAS generate a missing value without complaining with the ?? notation : myNumber = input(myString, ?? informat.); PG
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