Airways in AIRAC 0312/FSBuild

HelloJust on a flight from LGAV to EGLL with the FP:PIKAD UR193 GARTA UV62 YNN UM77 CONTE UL613 DIDOR UT420 ALESOI noticed UL613 is not progammable in FMC ("Invalid Entry"), so I suspected the published FP is 0311-based and used FSBuild with AIRAC 0312 to create a routing. The FSBuild created routing isn't programmable in the FMC (0312) as well - there seems to be a discrepancy between FSBuild 0312 airways and 0312 FMC airways... What ever I tried, I never got the FMC to accept an airway, even showing the airways in FBSBuild and try to assemble a FP manually - either "Invalid Entry" or "Not in Database" is displayed. When I load the FSBuild-created route, I get a direct routing from CONTE to DIDOR.The whole problem seems to be around UL613... any help appreciated.Kind regards,Nik