The date of VAT register is always blank for purchase ledger invoices created automatically by intercompany trade operations.

The system ignores the date of VAT register filing field on the sales tax group.

Given that all the information is within the one single system when performing intercompany trade, the system should follow the same logic for intercompany purchase invoices as it does with non intercompany purchase invoices, and apply the same logic to automatically assign the date of VAT register value.