It appears that the GeoNetwork WMS harvest selects an incorrect codeListValue for a service metadata record's srv:DCPList (Distributed Computing Platform). Currently, it enters HTTP-GET and HTTP-POST. However, there is a bit of confusion within GeoNetwork and among standards and profiles. Specifically, one could interpret a conflict between DCP in a service's GetCapabilities (OGC) and a service's metadata record (ISO):

• According to GeoNetwork's WiKi (http://trac.osgeo.org/geonetwork/wiki/ISO19119impl):
  • DCP is set to according the following rules:
    

    if (name(.)='Get' or name(.)='wfs:Get' or name(.)='wcs:Get' or name(.)='ows:Get') "HTTP-GET"

    else if (name(.)='Post' or name(.)='wfs:Post' or name(.)='wcs:Post' or name(.)='ows:Post') "HTTP-POST" 

• According to GeoNetwork 2.4.2's metadata editor's default profile:
  • HTTP-GET and HTTP-POST are invalid values. It uses the a similar codelist as the North American Profile.
• According to ISO 19119:2005(E), Annex D (Mapping to distributed computing platforms), page 54:
  
  • "The following environments and DCPs are considered as potential targets for platform-specific profiles of platform-neutral specifications:
    SQL-92 and SQL-99; CORBA using ISO IDL; Java 2 Enterprise Edition with EJB (J2EE); COM+; EXPRESS/SDAI; ODMG; C++ and other more traditional commercial OO programming languages; internet/http/Web Services"
• I could not find any information on DCP in ISO 19115
• I have yet to read through ISO 19139
• According to the OGC's service metadata record example in OGC 07-045 (OpenGIS Catalogue Services Specification 2.0.2 - ISO Metadata Application Profile), section D.1.6, page 110:
  • DCPList is set to something else again:
    

    <srv:DCPList codeList="http://someurl#DCPList" codeListValue="HTTPGet"/>

• According to the INSPIRE Profile ("INSPIRE Metadata Implementing Rules: Technical Guidelines based on EN ISO 19115 and EN ISO 19119" 2009/02/18):
  • The default value for DCPList is "WebServices"
• According to North American Profile (NAP):
  • HTTP-GET and HTTP-POST (and their variants) are not included in the nap_DCPList codelist (http://www.fgdc.gov/nap/metadata/register/codelists.html#IC_112). The code list looks like a derivative of  the ISO 19119:2005(E) DCP example list.
• I could not find anything in my ANZLIC Profile documents on DCP.

My bias is towards the North American Profile but I am not even sure what "Distributed Computing Platform" exactly represents and how it can be made useful.