It appears you've entered a string that doesn't form a coherent question in English or any other language I'm familiar with、The text bny cust rrn外汇附言 seems to be a mix of abbreviations, possibly related to banking or finance (BNY could refer to Bank of New York, RRN might stand for Retrieval Reference Number, and 外汇 is Chinese for foreign exchange), and 附言 which is Chinese for postscript or additional remarks.

If you're asking about a specific banking or financial transaction issue, or perhaps something related to foreign exchange, I'd be happy to try and help、Could you please provide more context or clarify your question?