From what I've read sounds like its hopeless to navigate through and update SOP Lines using SOPEntry.LineScroll.
One suggestion was to save the sales trx, modify it and bring it back up on the sop entry window.
1. Can I modify by writing to Dynamics.Forms.SopEntry.Tables?
2.Am able to save using Dynamics.Forms.SopEntry.SopEntry.SaveButton.RunValidate();
but not sure how to bring existing document back up with window still open?
Thanks