[SE-1348] eMessaging - Inconsistency when manually changing Previous Message
Product Line:	P&C
Component/s:	Other
Fix Version/s:	SICS 4.9.3

Aim of function

Clarify how SICS Insured Period reference was automatically arrived at for an eMessage with a Previous Message Reference that only links to the Business.

System Parameters Affected

New reference data item to SicsRefEMessagingReferencingMethodClass for previousMessageHybrid

Existing functionality affected

In InsuredPeriodReferenceRule where only partial references are set from the previous message then change the referencing method from previous message to the new item.