You can change the way the Referencing works by going to Settings 

Within Settings - select Reference generator

You can edit or change the reference to suit. 

I.e Property prefix is currently 


P = prefix

04d = number of places 


This will result in 




You can change the Prefix by selecting edit next the reference you would like to change and simply replace the letter "P" with something more suitable to your requirements.




This will now generate the property reference to display as: