Specify order currency (#4698)

* Add 'order_currency' to the various external order models

- By default will use the currency specified for the supplier (or customer)
- Can be specified per order, also

* Display order currency on order pgae

* Add 'order_currency' field

* Enable "blank" currency option (to default to the currency specified by the referenced company

* Fix default currency code when adding line items

* Remove 'total_price_currency' serializer field

- Now replaced with 'order_currency' for greater flexibility

* Bump api_version.py

* Update default order report templates

* Updated docs

* More docs updaes

* Adjust unit tests

* Use 'order_currency' in order tables

* Update purchase order api unit tests

InvenTree/templates/js/translated/purchase_order.js

@@ -65,6 +65,9 @@ function purchaseOrderFields(options={}) {
         project_code: {
             icon: 'fa-list',
         },
+        order_currency: {
+            icon: 'fa-coins',
+        },
         target_date: {
             icon: 'fa-calendar-alt',
         },
@@ -1670,7 +1673,7 @@ function loadPurchaseOrderTable(table, options) {
                 sortable: true,
                 formatter: function(value, row) {
                     return formatCurrency(value, {
-                        currency: row.total_price_currency,
+                        currency: row.order_currency,
                     });
                 },
             },

InvenTree/templates/js/translated/return_order.js

@@ -49,6 +49,9 @@ function returnOrderFields(options={}) {
         project_code: {
             icon: 'fa-list',
         },
+        order_currency: {
+            icon: 'fa-coins',
+        },
         target_date: {
             icon: 'fa-calendar-alt',
         },
@@ -349,7 +352,7 @@ function loadReturnOrderTable(table, options={}) {
                 visible: false,
                 formatter: function(value, row) {
                     return formatCurrency(value, {
-                        currency: row.total_price_currency
+                        currency: row.order_currency
                     });
                 }
             }

InvenTree/templates/js/translated/sales_order.js

@@ -62,6 +62,9 @@ function salesOrderFields(options={}) {
         project_code: {
             icon: 'fa-list',
         },
+        order_currency: {
+            icon: 'fa-coins',
+        },
         target_date: {
             icon: 'fa-calendar-alt',
         },
@@ -802,7 +805,7 @@ function loadSalesOrderTable(table, options) {
                 sortable: true,
                 formatter: function(value, row) {
                     return formatCurrency(value, {
-                        currency: row.total_price_currency,
+                        currency: row.order_currency,
                     });
                 }
             }