I try to add a new field(from InventTable) in the ItemId lookup of Sales lines.
Since I didn't find an easy solution through FieldGroups, I tried to extend the "InventItemLookupSimple" class and use the "addLookupField" method but it seems that it's private so it cannot be used in extensions. I also tried to use Reflection and DictClass to bypass the scope of method but I have read that these practices are not recommended.
Is there any simpler solution?
Thanks in advance.

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