SQL Datasource update operation triggers initial fetch

Hi,

I'm using smartgwt-power-3.1-p20130712.

I have a datasource with
- a field of type "creator"
- 2 fetch operations (one without operation id, and one with operation id = fetchById)
- one update operation that has cacheSyncOperation="fetchById"

When the client calls some form.saveData that triggers an update on the server, first the fetch without operation id is called and then the update is executed.

1) Is that fetch really needed? I don't have any field security specification and my authorization is not based on "creator" concepts. Could that fetch be removed? Or I should not use the "creator" type?

2) Why is called the fetch without operation id and not at least the one specified as cacheSyncOperation?

Regards,
Mihnea