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best practice validation contenttype

Posted By:      Posted Date: September 16, 2010    Points: 0   Category :SharePoint
hi, I'm working on and custom Schedule contenttype where I need to add and customer/s from and other list (and lookup field with multiple values). Now I need to validate the selected customer/s with the schedule so they do not get double reservations > check if the customer has and reservation on that day. Whats you advice to do this? I was looking at and custom field but I only need it in this contenttype. thanks steve

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