After installation:

**Working with Discounts:**

#. The total discount field will be readonly and automatically calculated
#. Always use ``discount1``, ``discount2``, and ``discount3`` fields to set discounts
#. When saving, the individual discount values will be preserved correctly

**Example:**

::

  Product: Widget
  Price: 100.00€
  Discount 1: 10%  → 90.00€
  Discount 2: 5%   → 85.50€
  Discount 3: 2%   → 83.79€

  Total discount: 16.21% (displayed, readonly)

**Before this module:**

After saving, you would see:

::

  Discount 1: 16.21%  ❌ (accumulated)
  Discount 2: 0%      ❌ (reset)
  Discount 3: 0%      ❌ (reset)

**After this module:**

After saving, you correctly see:

::

  Discount 1: 10%  ✅
  Discount 2: 5%   ✅
  Discount 3: 2%   ✅
  Total: 16.21% (readonly, calculated)

**Important:**

* Do not try to edit the total discount field (it's readonly)
* Always work with the three individual discount columns
* The total is recalculated automatically
