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)