a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS103 [Section] 6.2 [Statement text] 
If the Producer's metadata declares registration is not supported (i.e. requiresRegistration flag was set to "false"), then it MUST be valid to not supply a registrationContext to operations with this parameter.
WSRP v2.0 Specification
Statement text