SP0 is correct. The first 12.0 z/VSE Datacom installation tape went GA in April 2015 .
In 2016 a service update S1609 went GA . The DB00212I message still shows SP0 and that will most likely not change .
Since then the CA/Broadcom release strategy evolved to continuous delivery (CD) .
New features and product code corrections are delivered via PTFs that you install via MSHP in case of z/VSE.
With CA Datacom 12.0 for z/VSE there are no maintenance tapes anymore like in version 11.0 that got installed using CAPTFSEL.