Digest Method a child element of Encryption Method in soapui

Hi

I am trying to encrypt an XML message using soapui using cipher algo as AES-256 and transport algo as rsa-oaep-mgf1p. Top use transport algo as rsa-oaep-mgf1p, it is necessary that digest method tag be a child element of Encryption method tag. Can any one suggest that how can this be done in soapui? I am not able to do so using soap ui.

Thanks and Regards
Rajeev