For a sales scenario you receive a Down Payment from your customer in a month (for example June) and invoice the customer in another month (for example September).
In September when posting the Invoice, the Tax (GST) amount is different from the Tax (GST) amount in the Down Payment received in June.
This can result in an increase / decrease of the GST amount in the invoice.
You want the GST amount in the invoice to be the same as the GST amount in the Down Payment regardless of when the tax invoice is posted.
SAP Business ByDesign
The GST amount is different in the Invoice and Down Payment due to the difference in Exchange Rate.
This is the standard system behavior.
The GST amount in the invoice is based on the conversion rate applicable when posting the invoice.
For the Sales Invoice to take the same conversion rate as the Down Payment, you must change the Tax Date in the Invoice to the Down Payment payment date.
Exchange Rate Difference, Tax Amount in Invoice, Down Payment Tax Amount, Goods and Services Tax (GST), GST Amount. , KBA , AP-TTE-GLO , Cross-Country Extensions , Problem