Type: NumInGroup
Number of repeating groups of RoutingID (217) and RoutingType (216) values.
See Volume 3: "Pre-Trade Message Targeting/Routing"
Added in protocol FIX.4.2
See in: FIX.4.2, FIX.4.3, FIX.4.4, FIX.5.0SP1, FIX.5.0SP2, FIX.5.0SP2 EP240.