Here is the mock up of my wiring schematic ...is there someone who can take a look at it and tell me if there is something I am missing? When I connect the BMS Load Disconnect - I get a BMS Lockout Error E7 - I have checked all my wiring and it is as shown ....so I am not sure what is creating the error? DC Victron Wiring .pdf
You can not connect the inverter through the SBP. Take a look at the SBP manual or search the community and your will see lots of posts and material about not connecting the Multiplus, or any inverter through the SBP. Further no charge source should be connected to the output side of the SBP, only input. Current can only flow from Input to Output and not the other way round. This means that the Solar charge controller is the wrong side of the SBP as well.
The VE.Bus BMS will protect the Lithium batteries from over charge and discharge events. The SBP is only needed for loads that the BMS can nots witch. You might even find that the VE.Can connected MPPT will have charge controlled through the Cerbo, thus removing the need for the Cyrix. I would suggest you read all the manuals and not just look at wiring diagrams.
Ok...with your help and my dealer and a Victron Rep...we have a plan ....I have done a new wiring diagram and agree with your answer, so thank you for pointing me in the right direction - still in the draft stage - but here you go 
