I've managed to update the change log using the documentation for the ABAP developers guide to FPM.
New problem.
The table is updated but on screen it only shows blank lines (read only). As soon as I press 'insert' on the entity table it inserts a new line but also brings in the data (previously blank read only lines) already entered.
I tried to call a roundtrip event after defaulting to try to force it to display the data on screen but this didn't work either.
Any ideas?