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since at 3.2.1.X Jomsocial already take out that setting. for lock profile must done at each profile types it self. because if having "global profile lock" that make ambiguous.
thats a big issue! I dont want my member to change their profiletype after they decided to choose one.
Iam really dissapointed that you make changes or delete somtething without asking the community about it.
This was a standard feature that made sense.
if you dont want any users changing they profile type. you can set on every each profile types as lock profile.
edit all profile types from jomsocial admin Profiles > multiple profiles > edit, and set lock profile = yes
if payplans not recognize that settings. they must changing they code. because the setting at each profiles it self.