System Allowing to Enter More Characters than Allowed

Summary:

For Eg:-

For Entity Segment we have Allowed the Maximum Number of Characters is 4 and for suppose while Selecting the Code combination when creating the Manual Journal, it is Allowing to Enter More than 4 Characters.

Is there any Way that we can restrict the user to Enter More than Allowed Characters?

Please Note: - Once we Click on the Ok button after selecting the Code Combination, we are getting the error as expected, however we want the Error to get Populated while entering the code combination itself.

Please find the Attached Screenshot for the Reference.

Please let me know anyone has any solution for this.