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I can't use the autogenerated number setting on the record type, need to be able to have this number on the sublist before its actually saved

Hey, a little confused about the application use case. Can you elaborate and maybe I can give some ideas?

Hi @Dylan Shaver, thanks for your reply. Basically it is a mirror from Inventory adjustments. Currently I have 3 custom records: inventory adjustment, Item and Inventory Detail (Item is child of inventory adjustment and Inventory Detail is child of Item). So, in the adjustment record, when I fill in a line (Item) and I open its inventory detail (which is a suitelet popup) I want to have already the ID of its parent (Item) so I can save its child/s (Inventory details) and link them at the same time to its parent. (Without this custom field with desired ID, the item ID would only be available when saving the whole record). This way I can load them on the go and show existing Inventory Details in case I want to open the suitelet again. I kind of solved this by generating UUIDs on fieldChanged for each line by following some conditions, because I didn't find an easy solution to it by looking into documentation. Also another note: I didn't want to use the Item ID because the same Item could be set on several lines.