Welcome the Technical Support section. Help us in assisting you by providing us with a concise and descriptive elaboration of your issues. Be specific and if possible, provide us with a step-by-step instruction in replicating your problem.
I am new to jomsocial. I would like to set predefined values for certain field in the registration process. For example everybody in my community has a specific number. When the registrant types his specific number this number will be checked. If it doesnt correspond to one of the values that i have predefined he will not be able to finish the registration.
its hard to be like that. for fields customization we only provided the possibilities at jomsocial backend > profiles > customize profile
only that we can do. for more, I suggest you to build 3rd party extension.