Symbol, SymbolSfx, CUSIP

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Imported from previous forum

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I m designing a sell-side Equity trading system.
I hav a general Q, did anybody come accross a situation where Clients send any of the following:
1.Symbol="IBM", SymbolSfx="A"
2.Symbol="IBM.A" , no SymbolSfx.
3.only CUSIP.

I mean to ask, do ppl use customoized FIX messages to support variety of Client demands? Or we ask clients to stick to FIX.