To prevent any changes in documents after they've been saved, it is possible to lock invoices.
Go to Settings > Administration > Roles and permissions and select Modules and actions on the line of the relevant user role. Activate the right Lock invoices under the Settings section.
When you have activated the right, a new setting is displayed in Settings > Sales and Finance > Invoices.
The setting is only visible to the users in the role for which the right was activated.
When activating this setting, all of the invoices that have been created before the chosen date will now be locked from editing unless the user has the right to Modify locked invoices.
If a user needs to be able to modify already locked invoices, the above-mentioned right must be activated for the role that the user is in. Read more on user roles.
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