Hi,
The above message is expected to raise only when a journal entry is tried to print using the Print invoice option. Are you getting this on trying to print or on clicking the validate/post button in the entry ?

Thanks

Hi,

In the account module, the "_render_qweb_pdf" function triggers a check to verify if the invoice type is designated as an "entry". If any of the invoices fall into this category, it prompts a pop-up notification displaying a UserError message stating, "Only invoices can be printed."

 if any(x.move_type == 'entry' for x in invoices):

    raise UserError(_("Only invoices could be printed."))

Hope it helps