Buttons missing on Invoice Lines

Security Rights to SHOWCBTNS and NCHOWCBTNS options not set and sigoption not visible by default.

In Application Designer, bring up the Invoices application.
From the Select Action menu there is an option Add/Modify Signature
Options.
There are two that pertain to these buttons, but they do not appear in
Security Groups.
Please find the SHOWCBTNS and NSHOWCBTNS options and check the visible
Checkbox for both.
Save
In Security Groups, bring up the user having the problem's security
group and select the Invoices application.
In the options section, search in the description field for the value
Consignment to see the two options for the button.
By default, rights to both those options are checked.
If they are not checked, give rights to them and save.
Make sure the problem user has no open sessions, sign back in and test
to see if the buttons are now visible.