Message validations in XI has always been a matter of concern for developers. Especially for those who are even refrained from using BPM's. I always wondered so as to why the ‘Details' part is provided in the data type creation? As there is no check on the incoming message based on these details! Even though you provide the ‘Details' say like ‘maxLength=8' the XI will still accept the data which exceeds this ‘maxLength' there was no API which can stop this from happening. But for those who want this functionality they have two options: ** Stay on the current version of XI and find a way out. Well here is one of the way outs: Using a validation program in Java Mapping. 
*Step1:*Mention the Details about the fields in the DT(Data Type) 
*Step2:*Export the XSD(Schema) of the MT(Message type) created using this DT and place it at a location in server 
*Step1:*Mention the Details about the fields in the DT(Data Type) *Step2:*Export the XSD(Schema) of the MT(Message type) created using this DT and place it at a location in server
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