How to create an entity specializations after the generalization is already created?

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Hi, Im working on a general module for a company for SSO/ SAML. Using the SAML20 module from Mendix and adding a few custom MF in a seperate module. The SAML20 module creates the Administration. Account .  In the new desired configuration we want to create SSO.Account that is a specialization of Administration.Account.  The problem is that when a Administration. Account already exists the SAML20 module generates an error because it cant create a SSO.Account ( and the Administration.Account) because the email-address should be unique and it already exists.  Is there a way to add the SSO.Account to an Administration. Account after the Administration.Account is already there? Mendix Version 8.18.1  
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