Fix negative amount thing.

app/Helpers/Collection/Expense.php

@@ -55,8 +55,18 @@ class Expense
      */
     public function addToTotal($add)
     {
-        $add = strval(round($add, 2));
         bcscale(2);
+
+        
+        $add = strval(round($add, 2));
+        if (bccomp('0', $add) === 1) {
+            $add = bcmul($add, '-1');
+        }
+
+        // if amount is positive, the original transaction
+        // was a transfer. But since this is an expense report,
+        // that amount must be negative.
+
         $this->total = bcadd($this->total, $add);
     }
 

app/Helpers/Report/ReportHelper.php

@@ -515,7 +515,7 @@ class ReportHelper implements ReportHelperInterface
         $object = new Expense;
         $set    = $this->query->expenseInPeriodCorrectedForList($start, $end, $accounts);
         foreach ($set as $entry) {
-            $object->addToTotal($entry->amount);
+            $object->addToTotal($entry->amount); // can be positive, if it's a transfer
             $object->addOrCreateExpense($entry);
         }