Block the ability to edit documents. Why not possible?

Block the ability to edit documents. Why not possible?

Hi Zoho,
I see that when a document is sent to a customer and that we generate the following document (Estimate --> Sales Order) the user can edit the previous document that generated the next one.

Example:
The user cretaes an Estimate. It sent the Estimate that the customer Accept. Now the user generates the next document, the Sales Order. But, currently, the user can still edit the Estimate accepted.

We suppose that the document that generates the next one can't be edit by anyone (excpet Super Admin).

How come this is possible?