If you want to prevent your Administrators from using credits on reassignments, you can turn off their ability to spend credits on reassignments.  You Administrator will still be able to make new assignments.  If you want to prevent any spending of credits, look at our Credit Delegation feature.

To turn off the ability to make reassignments, select the View Account tab.

Choose Administrator from the account types.

Pick an Administrator from the list by selecting their name or email address.

Select the Account & Personal Details option.

Scroll down and find the Feature Access section.  There will be a toggle for Reassignments.  Toggle the feature to disabled.  Select Update Feature access to save the changes.  The Administrator will no longer be able to make reassignments.