Netsuite - Only One Request May Be Made Against a Session at a Time

I have the following integration map where I first ask customers and then their subscriptions which are as childs. However with this I get the following error "Only One Request May Be Made Against a Session at a Time". I googled that you might need to have upgraded license for Netsuite in order to get this to work.

 

Now the customer is asking from me that "SuiteCloud Plus License can have a user create up to 10 concurrent Web Services sessions. Is that enough? " And honestly, I have no idea whether that is enough.

 

Does someone have experience with the Netsuite connector and could answer to this? Or give recommendations about the map whether it can be built differently.

 

 

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