POST/PUT on erm/sas/{:id} endpoint appears to not save reasonForClosure

*Steps to Reproduce:

1) Open Agreements / Agreements tab
2) Click "New"
3) Fill in a name, status (closed), reason for closure (cancelled) and agreement period start date
4) Click "Save & Close"

We can see the response from the PUT/POST returns the reasonForClosure data but this data appears to not persist,

consequently future GETs on the same id won't contain the reasonForClosure property as this information was never saved and is therefore lost.