How to apply a patch to soap rtl in Delphi?

Question

I have corrected an error in a soap unit (Soap.OPToSOAPDomConv.pas), but I don't know how to rebuild soaprtl170.bpl (Delphi XE3).

I need to do this as I have a component to install in the ide that requires that bpl, and when dropping it in a form and activating it makes webservice calls in design mode.

In design mode it seems to use the soaprtl instead my modified Soap.OPToSOAPDomConv.dcu. In runtime it works as I'm not using runtime packages and my dcu is taking precedence.

Any help on how to recompile the bpl would be appreciated.

The concrete patch I want to apply in that file is the following:

function TOPToSoapDomConvert.InvContextToMsg(const IntfMD: TIntfMetaData; MethNum: Integer;
                                         Con: TInvContext; Headers: THeaderList): TStream;
...
(line 1446)
if not IsBareLiteral then
  MethNode := BodyNode.AddChild(ExtMethName, SoapMethNS,true)
else
  MethNode := BodyNode;
...

The patch consists in adding the true to the addChild.