HOW TO MAKE A TRANSACTION UNEDITABLE WHEN PRINTED
In System, there is a feature where a User is not allowed to Edit a Printed Transaction. This feature both applies for Purchases and Sales Module.
This Particular Security System Role is Not Allowed to Modify Printed Transactions both Sales and Purchases Module. This can be set under Maintenance > in the Security System Role where this option will be applied.
For example, this particular Purchase Invoice was already Printed. Please see KB – How to View Print Count.
When trying to Edit and Resave, the system won’t allow and prompt an error that says modification isn’t allowed.