Increase more lines for message to customers in invoice and have a special character in invoice num
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In the invoice number field, a plus (+) sign is reserved to increment the invoice number and a minus (-) to decrement the invoice number.
The original poster wants to use an underscore (_) in the invoice number field, and for some unknown reason, Quicken wants to treat the underscore (_) as a minus (-) sign. So when the user tries to key D L 2 5 6 _ in the invoice number field, Quicken stops when it sees the underscore (_) and changes (decrements) the invoice number to the next lower numeric value available.
I find nothing in Quicken Help that mentions using the underscore as a keyboard shortcut. On these grounds, I believe the op would be better off creating an IDEA discussion requesting that Quicken free-up the underscore to be used as a valid invoice number character - I would characterize that as fixing a bug.
However, the restriction the op is experiencing only applies when entering individual characters in the invoice number field. If the op creates the complete invoice number desired in something like notepad, then uses copy/paste to put that invoice number in the Quicken invoice number field, Quicken will accept it. I tested using both a minus (-) and an underscore (_), and Quicken accepted either when pasted into the invoice field as part of a larger invoice number (such as DL256_1 or DL256-1).
As to using "special characters" (or punctuation) in invoice numbers; in general Quicken does not object. I tested with the pipe (|), a greater-than (>), and a colon (:) and Quicken allowed me to key them directly in the invoice number field along with other characters (such as DL256|1 or DL256:1).
Regarding adding more lines to the Quicken invoice "customer message"; I seriously doubt that will happen.
Intuit, and now Quicken, have shown little interest in "improving" the business features of Quicken; I suspect that is because there are too few Quicken business users to make most business "improvements" cost effective. If adding lines to the customer message turns out to be trivially easy, perhaps Quicken will do it.