How to proceed with a requirement on changing the input type

I have a requirement that seems rather simple yet I am having a hard time achieving it. What I have is a table where there is a Data_Value field and a Data_Type field. The Data_Value is stored in the database as a VARCHAR2(100) and the Data_Type contains the following values: STRING, DATE, DATETIME, NUMBER.
The page I am working on is an update page, and what I am hoping to achieve through PPR is that whenever the user changes the Data_Type (I have these in a messageChoice) that the Data_Value will then be rendered with the correct settings.
Originally I thought that I could just programmetically change the DataType property in the messageTextInput I am using, but this was causing errors since I had it bound to that field in the view which is a Varchar. I then thought that I could create one field of each type and render the one I want based on the selection, but I am getting an error saying: Data Type - Attribute set for DataType in view object Xo2cCustAcctUpdateVO1 failed whenever a new value is picked from my picklist.
Does anyone have some suggestions on how I should tackle this issue? As a last resort I thought about just leaving that field as a String (which is how it is stored anyway) and do some validation in my controller to ensure it is formatted correctly.
Thanks,
Greg

Greg,
The simplest approach would be to define one field per data type and toggle them based on the data type selected from the choice bean. Use SPEL and PPR.

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