For OpenERP 6.1 we had account_invoice_layout module. It allowed:
- order all the lines of an invoice
- add titles, comment lines, sub total lines
- draw horizontal lines and put page breaks
OpenERP 7.0 Release Notes says
In OpenERP 7.0, the invoices support by default multi-line descriptions and the reordering of lines, which were the most used features of account_invoice_layout. We have dropped this module as it was not clean enough to respect new OpenERP quality standards
But I can't find how to order invoice lines.
Moreover, how should I enter descriptive lines? With unit price = 0 ?