@@ -37,8 +37,8 @@ def donation_income(context, invoice):
rbi.append(rbi_full_ticket)
elif line.total_price < 0:
rbi.append(rbi_early_bird_discount)
elif line.product.category.name == "T-Shirt":
rbi.append(line.total_price * fsa_rate)
donation = (invoice.value - sum(rbi))
donation = max(Decimal('0'), (invoice.value - sum(rbi)))
return donation.quantize(Decimal('.01'))