Table names differ only in case

Two tables of the scenario have names that differ only in upper and lower case, such as Items and items. The scenario is read without regard to case, so the two would be one table, and nothing was saved.

What to do

Rename one of the two tables the message names so that the names differ by more than case, then try again.

Where it comes from

Shown when a scenario is checked. It is one of the messages about the scenario.