Question: In E-UTRAN S1AP, if a message initiating a procedure contains IEs or IE groups in the wrong order, with too many occurrences, or erroneously present, and there's no message to report an unsuccessful outcome for that procedure, how should the receiving node proceed?
Option 1: Reject the procedure, reporting 'Abstract Syntax Error (Falsely Constructed Message)' using a standard error message.
Option 2: Terminate the procedure, initiate the Error Indication procedure with 'Abstract Syntax Error (Falsely Constructed Message)', and log the incident locally.
Option 3: Execute the functional requests of the message while ignoring the incorrectly ordered or extra IEs.
Option 4: Request retransmission of the initiating message with corrected IE order and presence.
Explanation: According to the specified behavior for messages without a standard unsuccessful outcome report, the receiving node must terminate the procedure and initiate the Error Indication procedure, using the 'Abstract Syntax Error (Falsely Constructed Message)' cause value. This ensures protocol integrity and error visibility.