If you're getting one of those annoying DME connection errors with user lawson when running your flow on the server but it works just fine within PF Designer then I have a possible solution for you (I just discovered this for a client).
If the DME has a SELECT statement with an Escape character (%3D for the = character) then replace it with the normal character.
Replace SELECT=STATUS%3D1 with SELECT=STATUS=1
When I did this my DME call worked on the server.
