HTTP validation description Bad multipart parameters parsing

A request was blocked due to Bad multipart parameters parsing rule. Request is like Content-Type: multipart/form-data; boundary=----WebKitFormBoundarya0W05LdZCqxSIphj . . . ------WebKitFormBoundarya0W05LdZCqxSIphj Content-Disposition: form-data; name="RequestTypeId" 1 ------WebKitFormBoundarya

Should the last line be ------WebKitFormBoundarya0W05LdZCqxSIphj? Is there a way to set up exemptions for this rule? For instance, it will not scan attachment?

Thanks.