StrucId (MQCHAR4)

This is the structure identifier; the value must be:

MQRMH_STRUC_ID: Identifier for reference message header structure.
For the C programming language, the constant MQRMH_STRUC_ID_ARRAY is also defined; this has the same value as MQRMH_STRUC_ID, but is an array of characters instead of a string.

The initial value of this field is MQRMH_STRUC_ID.