Is it necessary add Fast license for upgrade capacity for vmax box sold as RAW fast capable?

Hello Guys...

Customer has already purchased  a VMAX 20K with 3 tiers configured.

Configuration has 16 ssd, 168 sas e 56 sata.

Sales guys configured it at sales order perspective as "RAW capable to use fast "  ( I'm not sure exactly the name at  Direct express).

Now they ( EMC sales ) are trying to sell same capacity ( something about 150TB raw ).

The main question here is :

1-) Need they mark to sell FAST functionallity again for the proposed upgrade ?

2-) Or once box was configured as RAW fast capable in the beginning it is unnecessary now ?

The new storage capacity will create a new " lic "  file for configuration purposes.

At fast perspective will option # 2 , let box as NO compliant ?

May be that nobody here be able to answer this.

I appreciate if someone could indicate right person or groups to forward this.

Regards.

Joelson