WWFF started to convert the reference numbers into uniform 4 digit numbers. This will be done division by division.

The GxFF division made now already the change from GxFF-yyy to GxFF-yyyy

We will inform all divisions when the change will happen. At the end of the conversion we will have only 2 correct ways to identify a divison :

XFF-YYYY or XXFF-YYYY

(depending on the national prefix)