diff --git a/InvenTree/order/templates/order/purchase_order_detail.html b/InvenTree/order/templates/order/purchase_order_detail.html
index 5fb9a76ac9..404b947bd1 100644
--- a/InvenTree/order/templates/order/purchase_order_detail.html
+++ b/InvenTree/order/templates/order/purchase_order_detail.html
@@ -64,7 +64,9 @@ InvenTree | {{ order }}
 
 <h4>Order Items</h4>
 
+{% if order.status == OrderStatus.PENDING %}
 <button type='button' class='btn btn-default' id='new-po-line'>Add Line Item</button>
+{% endif %}
 
 <table class='table table-striped table-condensed' id='po-lines-table'>
     <tr>
@@ -118,6 +120,7 @@ $("#edit-order").click(function() {
     );
 });
 
+{% if order.status == OrderStatus.PENDING %}
 $('#new-po-line').click(function() {
     launchModalForm("{% url 'po-line-item-create' %}",
         {
@@ -139,6 +142,7 @@ $('#new-po-line').click(function() {
         }
     );
 });
+{% endif %}
 
 $("#po-lines-table").bootstrapTable({
 });
diff --git a/InvenTree/order/views.py b/InvenTree/order/views.py
index 5e85e0ae82..7666d007d9 100644
--- a/InvenTree/order/views.py
+++ b/InvenTree/order/views.py
@@ -87,7 +87,7 @@ class PurchaseOrderEdit(AjaxUpdateView):
         order = self.get_object()
 
         # Prevent user from editing supplier if there are already lines in the order
-        if order.lines.count() > 0:
+        if order.lines.count() > 0 or not order.status == OrderStatus.PENDING:
             form.fields['supplier'].widget = HiddenInput()
 
         return form
@@ -121,7 +121,7 @@ class PurchaseOrderIssue(AjaxUpdateView):
         }
 
         if valid:
-            order.issue_order()
+            order.place_order()
 
         return self.renderJsonResponse(request, form, data)