The documentation says:
Note: Splunk Enterprise's field aliasing functionality does not currently support multivalue fields.
This probably also means that if your events have both fields, then kap_chk will only be set once to one of them (probably the first time and then the second alias will be thwarted by the fact that kap_chk already exists). But even if you can create a multi-value field with FIELDALIAS , It still will not work with the lookup; you will still have to pass the stream through mvexpand . If you need something "automatic-ish" then I suggest creating a macro out of my solution and then always calling the macro.
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