Defining Masks for Task Web Client Fields
Use masks in Design Studio to restrict Task web client user input for a field to a specific format.
To define a mask for a Task web client field:
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                     From the Studio menu, select Show Design Perspective. 
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                     Click the Data Element tab. 
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                     Select the data schema entity that contains the field for which you want to define the mask. The entity opens in the Data Schema editor. 
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                     In the Dictionary area, select the data node for which you want to define the mask. 
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                     Click the Data Schema editor OSM tab. See "Data Schema Editor OSM Tab" for more information about the fields on this tab. 
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                     In the OSM Element Mask field, specify the string of characters used to define the format of the data in the Task web client field. Use a mandatory mask character to create a field where a user must enter information in the appropriate format to complete the task. See "About Masks" for more information.For elements that inherit data from a base type, this field is read-only. See "Leveraging Existing Data Information" for more information. 
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                     Click Save.