Shipment number: To set it to external numbering and automatically assign it like internal numbering

[HiroshiMori]

We are currently considering developing a system where the number range is set to an external number during shipment registration (T-cd: VT01N) and the number is automatically assigned like an internal number.

Therefore, we would like to ask the following questions to the experts.

①When registering an INVOICE with VT01N, etc., is there an EXIT that would retrieve the INVOICE number?

②We are considering how to handle this in the class “IF_EX_BADI_LE_SHIPMENT~AT_SAVE”.
However, in Include “MV56AF99N_FCODE_ROUTINES”, “Check external number” is output as an error first.

Ideally, the logic want be such that the external numbering is done automatically by “IF_EX_BADI_LE_SHIPMENT~AT_SAVE”.

<Ideal example>
External number range “A0001~A9999
A00~” is automatically assigned without entering the invoice number in the following screen.

Best regards,