Does EIR require Advanced Inventory Setting be enabled?

Please explain:

We've tried to install EIR numerous times with the Intuit Technical Support team remoted into our server and received the error:

"Quickbooks could not convert your data file to use Enhanced Inventory Receiving.

If you would like to use this feature, please call intuit support."

Intuit Support told us that they told us that we need to call their sales department and add the "Sub Advanced Inventory" plan to the account. The support lady said EIR won't enable without it.

Is the "Sub Advanced Inventory" plan different than Advanced Inventory?

If so how and what is it.

If it is the same thing then your technical support team has told us something different than what you are telling me.