Fun to see a work like that in production...

Regarding business rules. I wrote a conversion program which put rules for conversion into a table. Each rule returned a logical to indicate if the data fit the rule. If the record passed the test, an action was performed. Finally, the table indicated whether this test finished the testing on the field, or whether to move to another test.

It was amazing how that rules layer simplified the coding. And, I was able to accomplish probably 99% of the conversion within it.

Jay