## Report.check_inputs()


Check the preconditions (`requires`, the inferred bounds among


Usage

``` python
Report.check_inputs(con)
```


them) and the `SUM`s assumed to fit (`assumed`) on the tables of `con`, before anything runs: a batch that breaks one is refused with the precondition as the message (#444, goal 1).


## Raises


`PreconditionError`  
A precondition or an assumed `SUM` does not hold on the data.