a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS175 [Section] 13 [Statement text] 
When using SOAP 1.2, the Subcode element MUST be present and carry the corresponding WSRP error code in its mandatory Value sub-element. The Subcode element MUST be contained in a SOAP 1.2 Receiver fault code, for the fault messages defined in this specification. SOAP 1.2 faults MAY carry additional content in the Detail sub-element, but MUST carry the corresponding WSRP namespaced fault element.
WSRP v2.0 Specification
Statement text