This fault indicates that the given required Operation element and value is missing. For example, with the listReserve operation, if the browseType is "USER_NAME", then the request also requires a value for either userID or userPrimaryKey.
It could also mean than an invalid value was given for an element.
Cause
You did not specify a required element and value in the request.
Action
Include the required element and a valid value.
See Also
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