Generating a SolMan Key(Tcode SMSY)

After executing T-code SMSY in Solution Manager system, you need to do the following steps:

Create a system by right clicking on System entry and select Create new system.
Enter the System Name i.e., SID (3 chars)
Product = (select from the list)
Product Version= (select from the list)
Save the entries.

Select Menu Item "System--->Other Configuration" and enter the SID which you have created earlier.
Enter the Server Name(hostname)

Finally click on Generate "Installation/Upgrade Key Button "

The system generates a Key ,copy that Key and paste it in the SAPINST screen when it prompts for Sol man Key.