If the selector is less than zero (a system selector), the selector must be one that is supported by the MQAI. MQRC_SELECTOR_NOT_SUPPORTED results if it is not.
If the specified selector is not present in the bag, the call succeeds and zero is returned for ItemCount.
The following special values can be specified for Selector:
The following reason codes indicating error conditions can be returned from the mqCountItems call:
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