Merge work at parallel gateway (AND)
During synchronization, a token that was previously split at a branch is joined by collecting the individual tokens. In the BPMN process diagram, there are two ways to do this:
Parallel gateway
As soon as tokens with the same process number arrive at all the incoming connections of a parallel gateway with multiple incoming connections, one token with the process number of the activating token is forwarded to the subsequent objects of all outgoing gates.
Process/Subprocess
As soon as all parallel activities or processes in a Process or Subprocess object are completed, tokens with the process number of the activating token are forwarded to the subsequent objects via all outgoing sequence flows.