createExecution results in Error 104

[edgex004]

At the moment, 'POST' request in createExecution succeeds and responds with the created execution info, but the 'PUT' that follows returns:

{
errorType: 'ERROR',
clientMessage: 'We encountered some problems during processing this request. Please try again!',
errorCode: 104
}

This means that the result seen by createExecution is the Error 104. I'm not sure what the cause of this could be, since the IDs in the JSON body for the 'PUT' are the same values as for the 'POST'.