Hi All,
Facing this error in a single company of a multi company setup from last few days after running approx one year without any problem..
We are running Odoo 11 community with ngi​nx and postgres in different servers, and  server usage is average.
in all other branches, everything is fine. and running smoothly.
Companies have parent and child relation.
Error is not coming for all orders and the orders that causes the error sync with server when we retry. Sometimes at 1st attempt, or more.
So, we hope there is no problem with code. please correct if we are wrong
If this is caused by any configuration, it may effect all orders, that is not happening here. or at least it will block syncing order that raised the error once. but that order also syncs when we retry.
there is no problem with internet connectivity.
we tried changing browser, system, network and clearing browser cache..

Any suggestions are appreciated..