Hi, can I ask for a sample code of controller validation if the selected Date To - Date From was already paid?
Ex. 
1st payment :
Account#: 123
DateFrom -January 2022
DateTo -May 2022
2ndpayment :
Account#: 123
DateFrom -
May 2022
DateTo -May 2022
Error message : Applicable period May 2022 was already paid 
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