How to get extraurl parameter to work for dtldropdown

Document ID : KB000073192
Last Modified Date : 14/03/2018
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As per PDM Macro Definitions in documentation(docops), the parameter extraURL is defined to be used for dtlDropdown, however this parameter will not take effect until the same macro is transformed to dtlLookup dynamically
How does extraURL parameter work on dtlDropdown macro?
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The parameter is defined to work on dtlLookup macro as below observations

1. Parameter 'extraURL' defined on dtlDropdown will not make any difference as it is
2. This parameter 'extraURL' only kicks in where dtlDropdown becomes lookup ,i.e. the number of the dropdown list exceeds the value of SelListCacheMax as set in web cfg file.
3. As a result, if dropdown does not become lookup, this parameter does not have any effect in the macro.