My client is a partnership LLC formed in DE for investment purposes. They have received a K1 from another partnership that is a CA LLC.  The DE partnership does not have a CA SOS number. Pro Connect is giving me an e-file error requesting this information. Are they required to get a CA SOS number when investing in a partnership based in CA?  It is passthrough income... please help me figure out how to clear this error. 

Thank you!

Tina