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The EC parameter takes the same values as the original E parameter except for the value I (insertion). It is not a required field in the case of a template insertion or revalidation. It would be required for any metadata template with an EV parameter with value X.
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The CR parameter
The CR (change reason) parameter continues to exist as before. However, we replace error correction (XM) with error recognition (XR) as an allowed value.
Consider an incorrect PtoU template asserting that a particular chair is an instance of Table. The error was in asserting this PtoU template, not in inserting it into the RTS. Thus, the error was made on the part of the entity designated by iuia (in the PtoU template). Now either this entity (1) really believed that the chair was a table for some reason or (2) made a mistake in picking out a reference to the type (e.g., said "table" when she meant to say "chair" or selected "table" from the dropdown list when she meant to select "chair").