Resolution:
The adapter will process requests sequentially, even though multiple threads have been configured, under the following conditions:

1. Quality of Service - RVCMQ
2. Threads > 1
3. Only a single Adapter instance is deployed, though the configuration is RVCMQ.
4. Listener Task is set to 1.

The reason behind this behaviour of adapter is that the single adapter instance will act as both a scheduler and a worker. Therefore, the requests will be handled only one at a time.

In order to ensure that the adapter behaves in a multithreaded mode , please check that
1. There is more than one instance of adapter running
2. The listener task is set to a value corresponding to the number of dispatchers.