关于几个信用证条款的翻译：BASIC HEADER 和USER HEADER是什么意思?

关于几个信用证条款的翻译：BASIC HEADER 和USER HEADER是什么意思?
the event that it is necessary to contact the applicant in respect of any discrepant documents presented under this l/c a fee of usd 10000 or equivalent amount in l/c currency plus swift charges will be deducted for eachset of documents.这句怎样翻译
this is non-documentary condition.还有这句