You might need to update a mapping that is used in a mapping task.
When you update a mapping that is used in a mapping task and the mapping is valid, the changes are deployed to the mapping task. If the mapping is invalid, the changes are not deployed to the mapping task and the task uses the valid version of the mapping.
If you change the mapping so that the mapping task is incompatible with the mapping, an error occurs when you run the mapping task. For example, you add a parameter to a mapping after the mapping task was created and you do not update the mapping task to specify a value for the parameter. When you run the mapping task, an error occurs.
If you do not want your updates to affect the mapping task, you can make a copy of the mapping, give the new mapping a different name, and then apply your updates to the new mapping.