I’ve attempted to compile an invoice with18 lines but after saving, the first 10 lines have disappeared.
I couldn’t find how to convert line to “comment lines” so I set Item to —"— which disappear when saved.
Perhaps you can view Invoice 390 to view what remains.
There must be limits and/or rules preventing unit costs and quantities set to zero.
When entering an invoice, there is a cog wheel in the description area, click that, and a drop down gives more options.
Here you can covert to a comment line. You can then add your text, either before or after each item line, if you want to give additional information in regards to the invoiced products.
The comment lines should behave as per standard invoice lines, which will take some HTML formatting. You can use 4 standard spaces ( ) or an em-space ( ).