Custom title for purchase invoice

Hello @Tut this might have been asked before but I could not find the way, could you help me to find away to have a custom tittle for the purchase invoice if the purchase invoice contains Taxes. like that check box in Tax codes thats make a custom title for Sales Invoices and credit note.
Tax Codes

Please do not divert topics with unrelated questions. Yours is not really about tax codes for customers and suppliers, but about titles. It has been moved to its own topic.

The reason there is no custom title option on purchase invoices is that they are internal records, and VAT regulations around the world do not address them. So there is no requirement that they receive different titles because they include tax codes.

However, if you want to change the title on your purchase invoices, you can. You must use a custom theme. See Change a form title | Manager. I doubt it is worth the effort.

Wow. Two Tuts. :grin: