Defra doesn't recognise that hazard code

Hazard codes go across as HP_1 through HP_15, or HP_POP, and this one did not match.

What to do

1. Press Correct the record.
2. Pick the hazard code from the list in Tipslip.
3. Press Save correction and re-submit.

Tipslip sends the corrected record to Defra as soon as you save.