The dynamic Lookup transformation <transformation name> requires that a String or Binary lookup port and its associated port have the same length. Since lookup port <port name> has a length of <length> and the associated port <port name> has a length of <length>, the Integration Service used the larger length for both ports.
The dynamic Lookup transformation uses a String or Binary lookup port of a certain precision with an associated port of a different precision. The Integration Service uses the larger precision for both ports.
Edit the Lookup transformation and use the same precision for both ports.