Lookup method

public void lookup()

{

    QueryBuildDataSource    queryBuildDataSource;

    SysTableLookup          lookup;

    QueryBuildRange         queryBuildRange;

    Query                   query;

    query = new Query();

    // Add the first data source to the query

    queryBuildDataSource = query.addDataSource(tableNum(JournalizingDefinition));

    // Add the range to this first data source

    queryBuildRange = queryBuildDataSource.addRange(fieldNum(JournalizingDefinition, JournalizingDefinitionModuleValue));

    // Set the range

    queryBuildRange.value(enum2str(JournalizingDefinitionModuleId::GeneralLedger));

    lookup = SysTableLookup::newParameters(tableNum(JournalizingDefinition), this, true);

    lookup.parmQuery(query);

    // Add the fields to be shown in the lookup form.

    lookup.addLookupfield(fieldNum(JournalizingDefinition, JournalizingDefinitionCode));

    lookup.addLookupfield(fieldNum(JournalizingDefinition, JournalizingDefinitionDesc));

    lookup.addLookupfield(fieldNum(JournalizingDefinition, JournalizingDefinitionModuleValue));

    // Perform the lookup.

    lookup.performFormLookup();

}

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public void lookup(FormControl _formControl, str _filterStr)
{
    SysTableLookup sysTableLookup = SysTableLookup::newParameters(tablenum(ProdBOM), _formControl);
    Query query = new Query();
    QueryBuildDataSource qbds;
    QueryBuildRange  qbr;
    ;
    sysTableLookup.addLookupField(fieldnum(ProdBOM, itemid));
    sysTableLookup.addLookupMethod('itemName');
    qbds = query.addDataSource(tablenum(ProdBOM));
    if(Rejection_ProdId.valueStr())
    {
        qbds.addRange(fieldnum(ProdBOM, prodid)).value(Rejection_ProdId.valueStr());
    }
    sysTableLookup.parmQuery(query);
    sysTableLookup.performFormLookup();
}

Note : Lookup can be created by

1) By Relations

2) By Method

3) By EDT

4) By AutoLookup

5) By TitleField1 and TitleField2