[SalesForce] How to create master detail object that is attached to both a lead and contact

Workflows, Validation Rules and Before triggers fire on Lead Conversion only if the Setup > Customise > Leads > Settings > Enable validations and triggers is checked.

It might be worth checking if this setting is enabled, because otherwise the Lead Status value will not be synced to your custom field on Lead Conversion via workflow, and therefore not be copied across.

(Even then, I believe the Lead Triggers / Workflows fire after the Account and Contact ones, so it may be to late for the Lead Status to copy across)

The order of execution at Lead Conversion has been answered here

This can be achieved by a trivial LeadAfter trigger, or if the Lead Status is always set to Qualified upon Conversion, then you could set 'Qualified' as the Default Value on the Contact Lead Status field.

(One way of doing it also may be to only allow 'Qualified' Leads to be Converted - this can be controlled by having a different layout for Qualified Leads, when the status changes to Qualified, a workflow fires - changes RecordType to QualifiedLead and therefore associated Page Layout changes, which now has the Convert Button. With this approach, the Lead Status at conversion is available in advance and available to be copied across at Lead Conversion)

This post provided the order of execution of triggers for Lead Conversion.

A couple of ways :

• The Contact CreatedDate would be in the past, you could compare with a safety margin in mind, so you know that the Contact was created in advance of the Lead being converted.

• The Contact triggers fire before the Lead triggers, therefore in a ContactBefore trigger you could add the ContactIds of records where the trigger.IsInsert to a static Map/ Set. Being static this would also be available in the lead after, where you can check if the ConvertedContactId was in this Set / Map of newly Created Contacts and then vary your behaviour based on that.

I can't for the life of me think of a simpler solution. (part of me wonders if the ConvertedContactId is available sooner, say in a LeadBefore trigger when it is converted into an existing contact)