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This string code describes how modifications to an attribute for a PUT/UPDATE operation should be handled. It decides whether a change to the value of the field is allowed during a merge operation between two entities.

The same field within a source and target object is represented by s and t respectively. Whether the strategy requires data to be present for the field, is shown by { 0=no, 1=yes, X=irrelavant }. The value of the source field is migrated to the target field only if the predicate passes.

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