To edit a converted Lead in Salesforce, a user needs the "View and Edit Converted Leads" permission enabled at the Profile level or assigned through a Permission Set. Without this permission, the Lead's fields become read-only once it is converted into an Account, Contact, and (optionally) Opportunity.
This article answers a common question about converted Leads: can a converted Lead record still be modified, and what happens to it when its related Account is merged? Understanding this behavior helps you avoid confusion when reviewing Lead history or building reports based on modification timestamps.
Once a Lead is converted, most of its fields become read-only by default. To make changes to a converted Lead's fields, a user needs the "View and Edit Converted Leads" permission, described above in the Description section.
When the Account associated with a converted Lead is merged with another Account, Salesforce updates the `ConvertedAccountId` and `SystemModStamp` fields on that Lead. This update can cause the Lead to appear more than once in queries that are ordered by `SystemModStamp`.
This can result in unexpected results when querying converted Leads, and may display duplicates, such as the original Lead record followed by an entry reflecting the post-conversion Account, when querying based on `SystemModStamp`.
Keep this behavior in mind when maintaining a history of converted Leads or issuing queries against Leads based on `SystemModStamp`, since a single Lead can appear multiple times - once for each Account it becomes associated with.
000386118

We use three kinds of cookies on our websites: required, functional, and advertising. You can choose whether functional and advertising cookies apply. Click on the different cookie categories to find out more about each category and to change the default settings.
Privacy Statement
Required cookies are necessary for basic website functionality. Some examples include: session cookies needed to transmit the website, authentication cookies, and security cookies.
Functional cookies enhance functions, performance, and services on the website. Some examples include: cookies used to analyze site traffic, cookies used for market research, and cookies used to display advertising that is not directed to a particular individual.
Advertising cookies track activity across websites in order to understand a viewer’s interests, and direct them specific marketing. Some examples include: cookies used for remarketing, or interest-based advertising.