The use of an empty form is an integral part of successful Active Sync processing.
When Identity Manager processes records from the Active Sync resource, it uses either the default form configured for the system (Tabbed User form) or the form, if any, that has been defined for the administrator account.
Because the default Tabbed User Form can have undesired effects on data from the Active Sync resource, best practice suggests creating an empty form and assigning it directly to the proxy administrator rather than using the default form.
You should directly associate the empty form to the proxy administrator and not through an Admin Role. Setting the empty form at the Admin Role level causes the Tabbed User Form to be invoked during Active Sync processing.