There are a number of cases when accounts cannot be merged in Mariana Tek.
You cannot:
Merge employee or instructor accounts. This is true that even if an employee is made inactive, you will still not be able to merge the account that was once an employee account.
Merge an account with a “deferred/pending” order (add-on, etc.) into an account without a working credit card on file.
Merge an account with an active membership into an account without a valid and updated credit card on file.
Merge two accounts with the same active membership. One of the memberships will need to be canceled/terminated or done to merge accounts.
Merge two accounts if they both have upcoming reservations in the same class session. One or both of the reservations will need to be canceled or the class needs to have passed to merge accounts.
Merge an External Account created in another database with a Mariana Tek account.
Merge two accounts if there is not a home location on both accounts. Both accounts must have a Home location to merge or you will receive an error.