Block adding more than one credit card/cash check with the same number

Good morning, @SHAB21. 

It's great to see you back in the Community! 

The option to block more than one credit card/cash check with same number is unavailable in QuickBooks Desktop. I do recommend leaving our Product Developers some feedback so they can add this in the near future. 

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If you have any other questions, don't hesitate to ask. Have a great day!