feat: add totalExcludingTax property and update GL entry calculations

packages/server/src/models/ItemEntry.ts

@@ -68,6 +68,14 @@ export default class ItemEntry extends TenantModel {
     return this.subtotal - this.discountAmount;
   }
 
+  /**
+   * Total (excluding tax).
+   * @returns {number}
+   */
+  get totalExcludingTax() {
+    return this.subtotalExcludingTax - this.discountAmount;
+  }
+
   /**
    * Item entry amount.
    * Amount of item entry that may include or exclude tax.