when i create a new batch order , i need to show some items number in lookup

so i go to ItemId field in the dataSource ---> ProadTable--> ItemId --> lookup
i found the next
public void lookup(FormControl _formControl, str _filterStr)
{
InventLookup lookup;
if (#PmfEnabled)
//if (#PmfEnabled)
{
pmfFormCtrl_ProdTableCreate.fieldLookup(
fieldNum(ProdTable, ItemId), _formControl, _filterStr);
}
else
{
lookup = new InventLookup(_formControl, new Query(), formStr(InventItemIdLookupPurchase));
lookup.run();
}
}
but I didn't understood , where is lookup method
thank you in advance..
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