Please have look at the documentation of catx: "In a DATA step, if the CATX function returns a value to a variable that has not previously been assigned a length, that variable is given a length of 200 bytes." And if the concatenated values need more than 200 chars, you will get
WARNING: In a call to the CATX function, the buffer allocated for the result was not long enough to contain the concatenation of all the arguments.
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