BIP8408
Severity
20 : ErrorMessage
MESSAGE_SIZE_EXTRA_ALLOWANCE was < 0, it must be >= 0.Explanation
A configuration request was received which specified an invalid value. The MESSAGE_SIZE_EXTRA_ALLOWANCE value is used for the Real Time transport to declare the extra allowance size for messages to be delivered to client applicationsResponse
Modify the configuration request to specify a valid value for the attribute, and retry the request. This can be set by using : mqsichangeproperties BrokerName -e ExecutionGroupLabel -o DynamicSubscriptionEngine -n messageSizeExtraAllowance -v value A broker restart is required to activate the changes.