Admin site enhancements (#10099)

* Fix autocomplete fields for PurchaseOrderLineItem

* Add inline admin for SalesOrderLineItem

src/backend/InvenTree/order/admin.py

@@ -26,6 +26,8 @@ class GeneralExtraLineMeta:
 class PurchaseOrderLineItemInlineAdmin(admin.StackedInline):
     """Inline admin class for the PurchaseOrderLineItem model."""
 
+    autocomplete_fields = ['part', 'destination', 'build_order']
+
     model = models.PurchaseOrderLineItem
     extra = 0
 
@@ -54,6 +56,15 @@ class PurchaseOrderAdmin(admin.ModelAdmin):
     ]
 
 
+class SalesOrderLineItemInlineAdmin(admin.StackedInline):
+    """Inline admin class for the SalesOrderLineItem model."""
+
+    model = models.SalesOrderLineItem
+    extra = 0
+
+    autocomplete_fields = ['part']
+
+
 @admin.register(models.SalesOrder)
 class SalesOrderAdmin(admin.ModelAdmin):
     """Admin class for the SalesOrder model."""
@@ -64,6 +75,8 @@ class SalesOrderAdmin(admin.ModelAdmin):
 
     search_fields = ['reference', 'customer__name', 'description']
 
+    inlines = [SalesOrderLineItemInlineAdmin]
+
     autocomplete_fields = [
         'address',
         'contact',