Hi Shobhit
Try using Business Transaction Type for (EXASP), this is helpful as End Use of product can be configured and mapped from ECC and you can activate license based on "Business Transaction Type).
It might required little enhancement at ECC side to determine corresponding End Use based on "Product ~ Customer provided detail". Key is Ultimate Consignee (Customer) have to provide to End Use of Product, which need to be made available at sales order creation/save, once available GTS block sales order for respective license assignment.
Regards- Aamir