Changes have been made to allow ref value (participating-org and reporting-org) GB along with GB-1 when loading partner projects.
Merge pull request #184 from DFID/gb-as-prov-part-org-ref#293

Tested by JA against GPAF partners using GB-1 (Jeevika, WSUP, APT etc) and PK partner HTSPE using GB. Projects loaded and linked correctly.