Configure the stateful variable port to track the version of each user's records.

On the

Ports

tab, create the variable port

var_Version

and configure the port expression

var_Version + 1

.

The following image shows the variable port

var_Version

and the port expression:

The initial state value of the port is 0. The first time that a record arrives from a specific user, the value in the port is 1. The second time that a record arrives from the same user, the value in the port becomes 2.