The SmartDesign that has been created must now be generated. Generating a SmartDesign component may fail if there are any DRC errors. DRC errors must be corrected before you generate your SmartDesign top-level component.
If the ports of a sub-design have changed, the parent SmartDesign component will be annotated with the icon 
in the Design Hierarchy tab of the Design Explorer. This issue must also be corrected before you generate your SmartDesign top-level component.
Once there are no further DRC errors, the top-level component can be generated either recursively or non-recursively. Non-Recursive generation is enabled by default.