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When attempting to add a different membership type for a constituent that is in renewal, lapsed, or expired periods (and the membership program allows for mulitple memberships), one may encounter the following error:
You cannot add this item to your shopping cart . You cannot add a membership or membership renewal to a cart twice, and you cannot add a membership if you already are a member.
The validation error is preventing a user with an expired membership outside the renewal window from purchasing a new membership at a different level. (they are able to renew the expired membership level with no issue)