Ever wondered why EDIFACT output has a "," as a decimal by default?

The ISO representation for decimal mark is the comma ( , ) but point on the line ( . ) is allowed as per ISO 31/0-1981.
In GXS AI, we can change this value in the Trade Guide. At the UNA level (Highest level of hierarchy in EDIFACT in TG), go to Outbound tab and you will find an option to change Decimal Notation.