This code system http://hl7.org/fhir/action-required-behavior defines the following codes:

CodeDisplayDefinition
mustMustAn action with this behavior must be included in the actions processed by the end user; the end user may not choose not to include this action
couldCouldAn action with this behavior may be included in the set of actions processed by the end user
must-unless-documentedMust Unless DocumentedAn action with this behavior must be included in the set of actions processed by the end user, unless the end user provides documentation as to why the action was not included

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