I am reading note# 3 of table 6.3 and it states that you must subtract 4dB from any indation found in the root face of "CJP double groove weld joints", does this apply to only double groove welds as stated? We do a single V with a 6-8mm root face and one of our customer says you have to subtract the 4dB and the way it is worded I would say we don't, it is not a double groove weld joint. Does anyone have any opinions or have dealt with this before?