Attribute in web dynpro context of type binary?

I'm in the process of creating an ADOBE PDF based form in web dynpro.  I'm using a step by step guide and it's asking me to create an attribute In the context root to hold the PDFsource.  I'm suppose to enter the type as BINARY but it does not exist as a valid type? 
Any suggestions?

Hi Indrajitha,
Create attribute of type char1 and bind the property CHECKED with that.
Regards,
Farooq

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