I keep running into error messages in our ShopTech E2 shop system whenever I try to add the Invoice Date while creating a new invoice. Other functions—startup, order processing, customer checkout—behave normally, so the fault is isolated to this specific operation. I need the underlying cause identified and corrected so the date can be entered and saved without any errors. Once fixed, please outline exactly what you changed (code, settings, script, patch, etc.) so I can repeat the solution on the live server. Deliverables • A verified fix that eliminates the error when adding an Invoice Date to a new invoice. • A concise change log or step-by-step note explaining how the issue was resolved. • Confirmation that no other ShopTech E2 functionality is disrupted by the fix.