Concatenate Fields in Visual Integrator

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I've been trying to use the AND() function in Visual Integrator to combine to string fields.  I keep getting an Error 46 saying the Length of the string was exceeded.  I tried using two separate Temp fields to Truncate each of the original fields (I was able to truncate them successfully) and then combined them in a third Temp field, but I still get the same result...an error telling me "Length of string invalid"