PSoC 4 has limited routing capabilities for SCB blocks.
Workarounds: use USB based SPI Master (v2.50)
or control ss pin yourself (that's more reliable) by setting the pin accordingly at begin and end of a transaction.
Thanks Bob. Yes controlling the SS pin yourself makes better sense. I did not realise you could set number of SS to zero in the SCB SPI block.
I didn't know either ;-) I usually picked my own pin for that purpose.