When attempting to approve a PO from the Purchase Order Form, the form hangs and the session is terminated with the error : FRM-92100: Your connection to the Server was interrupted This may be the result of a network error, or a failure on the server. You will need to reestablish your session
from oracle support, I got this:
POXRQERQ: On Approve Requisition Error FRM-92100: Your Connection to the Server was Interrupted (Doc ID 1344959.1)
To resolve the issue here:
Download and review the readme and prerequisites for Patch:12801184:R12.PO.B.