Selecting the same account groups in the discount portlet giving the error

Issue

Steps to reproduce:
1. Start Liferay DXP 7.4.
2. Navigate to 'Discounts' under Pricing.
3. Create a new discount and Save.
4. Navigate to 'Eligibility' and select the specific account groups.
5. Select the account.
6. Now, again select the same account.
Expected Result: The user will be unable to select the account again, the message must be printed: this account is already selected.
Actual Result: When the user again selects the same account again, it's giving the danger error on UI.

The observed behavior is a known Liferay DXP bug which has been addressed in Liferay DXP 7.4 Update 65.