Payment Discount

Developer101

We have been using Payment Discount Excl VAT but now we need to use Incl VAT so I checked Adjust VAT Payment Disc on GL Setup

But when I post the new payment I get this error 'You must specify Payment Disc. Debit Acc. in Customer Posting Group Code=SOL' It was specified but I removed it because in the help it says 'if Adjust VAT Payment Disc on GL Setup is activated this field doesnt need setup' So i did setup in VAT posting groups and GL posting groups.

So why I am getting this error? I have done everything the help has told me. Please help? Do I need to create new Customer posting group?

Thanks,