GTIN and GTIN exemptions errors

Hi all,

Anyone come across this problem when trying to list a new item? I've got some items with a GTIN-13 and some that I list under an exemption, which I've had approved long ago.

Whichever way I go with these, entering the GTIN-13, or confirming I don't have a GTIN and have an exemption, I get this error; "The value specified for the field is lesser than the minimum allowed value."

This is despite knowing the GTIN-13 is correct and that the exemption is in place, as I've used it before.

Anyone had this?

Cheers

Steve