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title: "FIX 5.0 SP2 EP292: LegUnderlyingPriceDeterminationMethod <2189> field – FIX Dictionary – Onix Solutions"
description: " "
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# LegUnderlyingPriceDeterminationMethod <2189> field
## FIX 5.0 SP2 EP292
### Description
Type: [int](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep292/index.html#int)
Specifies how the underlying price is determined at the point of option exercise. The underlying price may be set to the current settlement price, set to a special reference, set to the optimal value of the underlying during the defined period ("Look-back") or set to the average value of the underlying during the defined period ("Asian option").
Valid values:
- 1 = Regular
- 2 = Special reference
- 3 = Optimal value (Lookback)
- 4 = Average value (Asian option)
### Used In
- [](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep292/compBlock_InstrumentLeg.html)
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