ORA-26996
Automatic Conflict Detection and Resolution procedure is not supported for blockchain or immutable table string.string.
Cause
Only add and remove Automatic Conflict Detection and Resolution procedures are supported on blockchain or immutable tables. Column groups, delta resolution. setting columns unused, and custom handlers features are not supported for blockchain or immutable tables.
Action
If changes besides the unsupported features are needed in the Automatic Conflict Detection and Resolution configuration then the configuration will need to be removed and then added with the new configuration.