What does this error mean?
This error is incurred when a report is using multiple Data Set Definitions:
And both datasets are called into the same Table
And there is a field in one dataset, that is not in the other. In other words, the components of the DetTmp table do not agree with one another.
Resolution:
To Resolve this error, add the field that exists in one of the datasets to the other datasets. If making amendments this will be easy to spot, because the new field you are adding will need to exist in all Datasets. Setup of that field across the datasets can be identical
If you are unaware of what field is missing, recommend to export all datasets to excel and vlookup to find.