mustUnderstand should be configurable

Organization Name (Required - If you are an Oracle Partner, please provide the organization you are logging the idea on behalf of):

Juva N.V.

Description (Required):

OIC adds mustUnderstand attribute to custom header which is not accepted by service. Sometimes a third party endpoint is not handling the mustUnderstand attribute well. We should be able to configure the usage of the mustUnderstand attribute from within OIC

Use Case and Business Need (Required):

Sometimes a third party endpoint is not handling the mustUnderstand attribute well.

Enhancement Request / Service Request: 3-26801232271