Two kinds of changes, which will require source adaptation, can be distinguished.
Versioning should be kept in mind also. For example, we have “The Vocabulary” v.1 from 01.01.2012, and it has the records:
| Procedure code **| Procedure name ** | |
| А15 | Complete blood count |
| B17 | X-ray photograph |
Then we receive a new version of the “The Vocabulary” v.2 from 02.02.2012. It has the records:
| Procedure code **| Procedure name ** | |
| А15 | Ultrasonography |
| B17 | X-ray photograph |
Having the procedures account with structure:
| Person_id **| Procedure code ** | |
| P01 | A15 |
We will encounter the invalid data after “The Vocabulary” v.2 will be applied.