if a SalesOrderItem in system X references a Product, then the locality-of-reference principle dictates that X is also the data source of the referenced Product when you follow that reference. Even though X is not the leading system for Product in the landscape
local list of data sources.
Whenever a key-based request is received with a key originating from one of these sources, then this source is used to answer the query instead of the leading system.
Key users can create multiple rules for each entity, and annotate additional rules with a short string label, called a cue. Defining a cue for a locating rule makes the rule more specific. If a request contains a cue, then the locating policy looks for a locating rule with the given cue and use that rule instead of the rule without cue. Cues provided in a data access request apply to all parts of the request, that is, in a request like CustomerQuote('123')/Customer?cue=mycue the cue mycue applies to both CustomerQuote and Customer. For each entity, a locating policy must have one default rule without a cue.
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