Known Issue 342

Loss Modification factors do not apply on expected lines when using rules that include locationID or locationUDF.

Issue ID	342
Summary	Loss Modification factors do not apply on expected lines when using rules that include locationID or locationUDF.
Description	In the 2021 release of Touchstone (version 9) we enhanced the Loss Modification feature to process a very large number of event-based rules. However, during this design change, we did not account for a couple of specific scenarios, which now result in the incorrect application of loss modification factors. If the Loss Modification template contains rules that have locationID, and the analysis is run with a multi-core setup (as is commonly the case) then Touchstone runs into issues with shared memory and is unable to fetch the correct factor as applicable to a location. Additionally, if the Loss Modification template contains rules that have locationUDF or locationID, and if disaggregation is turned on for the analysis, then Touchstone fails to recognize the appropriate factor needed for each of the secondary locations produced from the primary location. However, this comes into play only when there are event-based rules in the same template, or in the same rule itself.
Resolved in	Touchstone 2022
Date posted	6/27/2022
Software versions affected	9.0, 9.1
Feature set	Detailed loss
Models	All
Potential for loss numbers impact	Yes
Workaround	If exposure is not disaggregated, the issue with locationID can be resolved by running the analysis using a single core. The issue with locationUDF or locationID and disaggregation does not truly have a workaround, other than rerunning the analysis in such a way that disaggregation is not triggered. This can be achieved by either turning disaggregation off or by ensuring that the exposure view target does not have any aggregate locations that would automatically disaggregate.