Why is j=0 to j'=0 forbidden by the parity rule if spin orbit interaction

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Why is j=0 to j'=0 forbidden by the parity rule if spin orbit interaction is significant?
 
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No matter what the interaction, a photon carries one unit of angular momentum.
 
Meir Achuz said:
No matter what the interaction, a photon carries one unit of angular momentum.
At least.
 

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