Using error code 3 in the IK5 segment is correct. Supplementing error reporting in IK5 by sending IK3/IK4 for exact element location is valid per the standard and the TR3, but not necessary. In the second example, IK4 is not correct, code value 7 in data element 621 meaning "Invalid Code Value" is a misuse of the element. Data element 329 does not contain code values. The two IK5 segments are not correct, only one IK5 can be sent. As for the content of the two IK5 segments, code value 5 in data element 618 meaning "One or More Segments in Error" is not a violation of the standard, but not necessary because code value 3 meaning "Transaction Set Control Number in Header and Trailer Do Not Match" is precisely the error.
Using error code 3 in the IK5 segment is correct. Supplementing error reporting in IK5 by sending IK3/IK4 for exact element location is valid per the standard and the TR3, but not necessary. In the second example, IK4 is not correct, code value 7 in data element 621 meaning. Invalid Code Value" is a misuse of the element. Data element 329 does not contain code values. The two IK5 segments are not correct, only one IK5 can be sent. As for the content of the two IK5 segments, code value 5 in data element 618 meaning "One or More Segments in Error" is not a violation of the standard, but not necessary because code value 3 meaning "Transaction Set Control Number in Header and Trailer Do Not Match" is precisely the error