When you create a NetSuite connection, the following error might occur:
Test Connection Failed for <connection name>. ConnectionFailedException: [Connection]. ExceededRequestLimitFault: Only one request may be made against a session at a time.
You might receive this message because you can use no more than one NetSuite connection at a time. To resolve the issue, you can request the Suite Cloud Plus account from NetSuite, which allows up to 10 mappings for each user.