Sage 100

v2014 I am trying to find the role security or setup option that prevents a user from entering a duplicate SO Invoice number. End user does not want to re-use invoice numbers and has about 10 years of invoice history.

Wasn't aware of such an option, only duplicate Customer PO numbers.

Thanks Bob. I was afraid of that. Seems a script may be in order. Interesting that the user is prompted if they want to re-use the invoice number. Also, as you pointed out, there are options available for duplicate POs. There is also a role permission for customer PO numbers (see attached).