Hi Waleed, interesting. Ours works exactly the same with the '/' when duplicating. But the moment you use a line in Parts or Operations, it stops working. I wonder what caused that then.

Do you have a repair order created with / as a name? if Yes then that's what cause the issue just change the name of this order and try to duplicate.
Do you have any custom module for repair module?
When you duplicate an empty order is the order number increasing?
Do you have multi company?

Hi Waleed. Sorry for the late reply. No, the one that I want to copy does have a different name, not the default '/', but 'FM-002'. We do not have any custom modules in the repair module. The ID number is increasing when duplicating an 'empty' order yes. And yes, we have a multi-company system.

Since you have multi company, do you have a sequence for each company for repair order. The prefix of the sequence need to be different for each company because the order name is unique but not for each company.

Oh wow. You might be right, it has something to do with that. I just found out what fixed it when meddling with sequences and the prefix '/'. So, when there is a repair order that was duplicated but just not updated, it keeps the name with '/'. The moment that is the case, you cannot duplicate any other repairs. Doesn't matter in which company you are, there is an existing repair order with the name '/' and it just stops working. Now I deleted the one named '/', now there is no problem with duplications. Interesting. THank you for your help!

Great. You need to create sequence for each company with different prefix because of the constraint of the name to be unique in all company. as per below line:

_sql_constraints = [
('name', 'unique (name)', 'The name of the Repair Order must be unique!'),
]

I will discuss the wishes of the sequences with the corresponding companies. Not everyone wants numbering, so might just change the default to 'Title' so everyone knows they should change '/'. Perfect thanks.