Unfortunately the SAP SQL Connector is not available with a Qlik Sense Business License. This connector is only available with a Qlik Sense Enterprise Licenses and then purchased as an add on.
I apologize for the confusion of it showing in Qlik Sense Business and we are currently working on a better message instead of "license not valid".
If you would like to look into purchasing Qlik Sense Enterprise and the SAP connector please contact your account manager or the sales team. The easiest way to contact sales is through the contact sales button in myqlik.qlik.com/portal
Also please see below for the list of included connectors with Qlik Sense Business. Please note this list is a little dated and the some of the coming soon ones are now available or in beta