FIX Field 718
Type of adjustment to be applied. Used for Position Change Submission (PCS), Position Adjustment (PAJ), and Customer Gross Margin (CGM).
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For example if you were writing a clarification on how to specify the "quantity" of an order in FIX, you might add the following relevant link, http://www.fixprotocol.org/discuss/read/f5014573, to back up your points.