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Automatic Transfer of Billing Date to
Accounting Documents 
When you create an invoice in Sales and Distribution (SD), the system copies the billing date into the Document Header Text field in the accounting document. This information is then used by the VAT Register.
...
1.
Create a project for the
enhancement SDVFX001 (see
Creating an Add-On
Project).
2.
Within this project,
create a function module for the user exit EXIT_SAPLV60B_001 that reads the
billing date and copies it into the Document Header
Text field in the accounting document (see
Creating
Customer-Specific Function Modules).
When a sales clerk
create a billing
document
in SD, the system transfers the
billing date to the Document Header Text field in
the corresponding accounting document.
When you run the VAT Register for a given period, you enter the first and last dates of that period in the Tax Date field. The report then only covers the invoices whose billing date falls within this period.
