Error: VAT rate must be limited to 5 or 15 for Standard Rated category

Dear @Ankit.K.Tiwari
One of our clients has received the following error message while submitting an invoice:

Error:
The Document level allowance VAT rate (BT-96), Document level Charge VAT rate (BT-103), VAT category rate (BT-119), Invoiced item VAT rate (BT-152), Prepayment VAT rate (KSA-34) must be limited to one of the following values (5 or 15) when the relevant Document level allowance VAT category code (BT-95), Document level Charge VAT category code (BT-102), VAT category code (BT-118), Invoiced item VAT category code (BT-151), Prepayment VAT Category Code (KSA-33) is ā€œSā€ (Standard rated).
In other words, for Standard Rate VAT Category, the rate can either be 15% or 5%.

For this B2C invoice, the client is following the correct payload format. The same format has been successfully used in previous invoices without any issue. However, this particular one was rejected.

I also tested the same payload in both production and test environments, and it was approved without any issue there.

Kindly advise on how to proceed. Your help is much appreciated.

@Tarun please check the percentage specified for all the fields mentioned in the error message. Most likely reason is that the percentage is not precisely 15 or percentage is 0 for a VAT Category Code S.