OpenMage:: "Wrong field specified." error on saving configuration

Note: This is a historical reference, not a current security baseline. Magento 1 is end-of-life.

Wrong field specified. error is shown in OpenMage Backend on attempt to save configuration on System > Advanced > System or saving configuration changes in non-default Configuration Scope:

Cause

Regression caused by commit c202af9b2f56550495462c82a459a4f741607b66 merged into 1.9.4.4 tree on January 2021 and included in v19.4.10 release.

Solution

Update to OpenMage v19.4.11 where the issue was fixed with commit c202af9b2f56550495462c82a459a4f741607b66 or apply the patch.