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Creating a rule to input month of diagnosis
I need help with writing a rule. I have a column in my CRF for capturing the month of diagnosis. However my client wants me to incorporate a rule wherein if the month of diagnosis is unknown they must be able to enter Unk for the month. How can I create a rule wherein I restrict the data entry person from only entering 1-12 for the month and as well as enter Unk if month of diagnosis is not available. I plan on keeping the data type as String but I want to incorporate these rules so that the data entry person does not randomly enter any number. Please help