Parameters in custom lookup with FormAutoLookupFactory :: buildLookupFromCustomForm

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I'm looking at the std code and can't understand why when we create a lookup in class HcmWorkerLookup -> lookupWorker there are lines like below

FormAutoLookupFactory::buildLookupFromCustomForm(stringControl, workerLookupForm, AbsoluteFieldBinding::construct(fieldStr(HcmWorker, PersonnelNumber), tableStr(HcmWorker)), args);

Here as I understand we specify the fields from which lookup should return as a third parameter , e.g it's AbsoluteFieldBinding::construct(fieldStr(HcmWorker, PersonnelNumber), tableStr(HcmWorker)),

Now if I go to the form HcmWorkerLookUp -> run(), here we again fo the same :

 this.selectMode(hcmWorker_PersonnelNumberID);

What's the purpose of doing this twice?

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Also I'm trying to understand how filtering happens. If I type in ABC* in standard lookup, the values in the lookup when opened get filtered by this value. Which method is responsible for this?

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