FinancialItem - Provide defaults so that stricter ConformanceTest will pas

FinancialItem - Provide defaults so that stricter ConformanceTest will pas

Context: There were three separate, concurrent PRs - two added more tests
and events to APIv4, and the third added a new entity (FinancialItem).
FinancialItem got merged first.  I'm working reconciling the other two...
and discovered that `FinancialItem` isn't passing.

Problem: When the `ConformanceTest` creates a `FinancialItem`, it doesn't
fill in valid values for `entity_table,entity_id`. These values are
important to the access-control criteria used in reading-back data.