Unable to add products to opportunities

Symptom: I click the "Add" button in the Products/Services tab. I then complete the form, click OK and the products that I just added are not showing under the Products/Services tab.

Product Details:
Product: Pro
Version: v18

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Cause:

There can be more than one possible cause for this issue:

• The Quantity field is missing or has not been filled
• The decimal symbol in the Quantity field is incorrect

Solution: 

Quantity field missing

1. If the Quantity field is missing, click the Display Fields button
2. Highlight the Quantity field in the left section, and click the single arrow to the right
3. Click OK
4. Verify that the Products are showing under the Products/Services tab

Incorrect decimal symbol in the Quantity field

1. Attempt to enter either an integer number in the Quantity field. Otherwise try using a comma instead of a dot or a dot instead of a comma.
2. Click OK
3. Verify that the Products are showing under the Products/Services tab