How to change the 'Automtically Apply Amount Paid' value in the AR module.

This would require a simple customization to the ARPaymentEntry.LoadOptions DAC.

using PX.Data;

public class LoadOptionsExt : PXCacheExtension<PX.Objects.AR.ARPaymentEntry.LoadOptions>
{
    [PXMergeAttributes(Method = MergeMethod.Append)]
    [PXDefault(false)]
    public virtual bool? Apply { get; set; }
    public abstract class apply : PX.Data.BQL.BqlBool.Field<apply> { }
}

If you are not accustomed to customizations, talk to your VAR about this.

Hi ​@Phalbert 

Please refer to the post below that has a question similar to yours. It may be helpful to you.

Best Regards,

NNT

hello ​@Phalbert 

Go to Customer Profile (AR3030PL) and ‘UNCHECK’ the [AUTO APPLY PAYMENTS] as shown below: