System perform Duplication on check number in two different transaction :

Dear Experts

User Requirement:- 

Our user has a requirement related to check number. A single check number did not used an another transaction. Here user has also transfer their fund to one bank to another bank and they need check detail in bank transfer window.

To be meet above user requirement we have define Dff on bank transfer form by following name

• Transfer number
• Check Number
• Check Date
• Payee

Unexpected Behavior

Let suppose user have create a payment by using check no 12345 for any particular transaction.

In cash management mean while another user have run transfer bank account functionality with the use of same check number 12345 which was already used in above payment transaction.