How to modify ABAP type in XML Schema elemet

Hello,

Does anyone know how to modify and ABAP type from an Attribute of XML schema element?

I need to change it because when I consume the Web service the attributes that are INT aren´t send if a set or leave the default value ‘0’ (label CertificadoOrigen="0" is not send).

So I am trying to set the type attribute to string to avoid it, so far I haven’t find where I can do it.

Any help would be appreciated.