Let me remind how this discussion was started.
The actual problem was “Landed Cost Voucher” please follow this link for more information.
Landed cost voucher has been a big problem. After posting a voucher you cannot add another voucher.
You cannot even cancel a posted voucher. In order to test it, I installed the ERPNext from Bitnami as the installation was failing from github.
It is still the same even we installed it from Bitnami.
Following is the thread where we have the problem: