19.23Add a “business rule ID”

This is where I would improve the mapping spreadsheet.

For example:

Rule ID	Requirement
BR-001	Existing customer is updated, not duplicated
BR-002	Missing phone preserves existing SF phone
BR-003	Source status CLOSED maps to SF INACTIVE
BR-004	Invalid customer ID rejects entire request
BR-005	Contact failure does not delete Account

Then mapping can reference:

BR-002

Tests can reference:

BR-002

Now you have traceability:

requirement
→ implementation
→ test