add handling for Tier3 quantity divisibility

Author: claire-peters

coldfront/core/allocation/templates/allocation/allocation_detail.html

@@ -115,11 +115,11 @@ <h3><i class="fas fa-list" aria-hidden="true"></i> Allocation Information</h3>
               <th scope="row" class="text-nowrap">Service Period:</th>
               <td>1 Month</td>
           </tr>
-          {% if offer_letter_code %}
+          {% if expense_code %}
             <tr>
                 <th scope="row" class="text-nowrap">Requested Expense Code:</th>
                 <td>
-                  {% for code in offer_letter_code %}
+                  {% for code in expense_code %}
                     {{ code.value }}<br>
                   {% endfor %}
                 </td>

coldfront/core/allocation/views.py

@@ -608,6 +608,10 @@ def form_valid(self, form):
         quantity = form_data.get('quantity', 1)
         allocation_account = form_data.get('allocation_account', None)
 
+        if resource_obj.name == "Tier 3" and quantity % 20 != 0:
+            form.add_error("quantity", format_html("Tier 3 quantity must be a multiple of 20."))
+            return self.form_invalid(form)
+
         # A resource is selected that requires an account name selection but user has no account names
         if (
             ALLOCATION_ACCOUNT_ENABLED