Hello! is it possible to customize the "inventory detail form" to display a custom field?

Assuming you mean the little pop-up window that comes up on transactions to fill in serials or lots, I think the answer is no.

@vivian tsang I guess yes. You can add custom field to that little popup window. But it depends on the purpose of that custom field. There is a bundle called Lot auto numbering and through that bundle you can also add custom fields to inventory details window. Item number fields option in customization will be used to create fields that will be appear in that window.

@Nawarain wow, thank you

@vivian tsang You are Welcome.