Well, it could be that or something simple.
Walking through it…
Are you sure that the customer you are running the BPM against has a ShortChar02 value of “NG”?
Have you cleared the form you’re using to trigger this code? Call Context BPM variable data is kind of icky to work with. Sometimes it clears, sometimes it doesn’t. There’s an article on this forum about when the callcontextBPMdata persists vs. clears…
You could also try instead of using call context variables to create your own BPM variables and explicitly clear them and set them in your code. That would help to simplify I think