Troubleshooting > Troubleshooting > Troubleshooting a mapping task
  

Troubleshooting a mapping task

When I run a mapping task, the task fails with the following message:
TE_7073: Expecting Keys to be ascending.
This occurs when you configure an Aggregator transformation for sorted data, but do not sort the data earlier in the data flow. For some connection types, you can configure a Source transformation to sort data. You can also use a Sorter transformation.