Hi,
I've managed to install an internal number assignment for the GTIN / EAN in material master which works fine.
Now we need to assign the same GTIN to different material numbers.
Since the defined number range is marked as internal I cannot use this number range as the external number range in spro -> Define Attributes of EANs/UPCs (number categories/EAN categories):

I cannot make an external number range with the same data as the internal one, since number ranges must not overlap.
So, here is the question again:
How can I achieve that 1. the GTIN is generated and 2. a GTIN, which is already assigned to another material, can be entered manually in the GTIN field?
Any advice is appreciated,
thanks,
Marco.