How to Configure Single Threading of Interface Messages

Good day, Experts

We have an ABAP job that accumulates a large amount of data within ECC that will translate into 500 messages to PI.

The first message that is sent translates to a DELETE ALL type message that clears the resulting database tables on the other end of the interface in preparation for the next 499 INSERT_UPDATE type messages.

Problem is that in PI 7.0 we have not found a way to ensure that the first message sent which is the DELETE message executes before the following INSERT_UPDATE messages.

We're finding the that all of the messages are landing in mulitple XBTO8___00xx parallel queues which are processing independantly.

Any help you could offer would be greatly appreciated.

Thanks,

Chad