http://hl7.org/fhir/StructureDefinition/operationoutcome-detectedIssue|5.2.0

A reference to a stored contraindication that is the basis for this issue. A recipient can expect that the item referenced in this extension is being retained for record keeping purposes.
NameFlagsCardTypeDescription & Constraints
Extension
0..1Reference to a contra-indication that is the basis for this error
 
extension
?..0
 
url
?..?
 
value[x] *
1..?
 
 
valueReference *
1..?Reference