Question: A UTRAN Iu interface RANAP signalling message initiating a procedure is received with Information Elements (IEs) in the wrong order. How should the receiving node behave if the message has a normally defined report for an unsuccessful outcome, but the received info is insufficient for all required IEs in that report?
Option 1: Execute the procedure while ignoring the out-of-order IEs and send a success acknowledgement.
Option 2: Reject the procedure, using the standard report message with 'Abstract Syntax Error' cause, omitting the unknown IEs.
Option 3: Terminate the procedure and initiate the Error Indication procedure with 'Abstract Syntax Error (Falsely Constructed Message)' cause.
Option 4: Request retransmission of the entire message before taking any further action.
Explanation: According to the specified behavior for messages with IEs in the wrong order and insufficient information to report an unsuccessful outcome accurately, the receiving node should terminate the procedure and initiate the Error Indication procedure. This ensures the error is handled properly without attempting to execute a potentially flawed request or sending an incomplete error report. The 'Abstract Syntax Error (Falsely Constructed Message)' cause value is used to indicate the nature of the problem.