Some issues when consuming RFC2 model using WebDynpro Java CE 7.11

Hi Experts ,
I'm using Web Dynpro for Java to develop our project. I have issues when I use RFC 2 model to call BAPI function . I already create the RFC 2 model successfully to call one PO BAPI function --- BAPI_PO_GETDETAIL. The whole project build and deploy successfully. At run time, it will call the execute() function of the model object. It also works fine and get the return values.
I just want to get two return objects : PO_Items and PO_Item_Schedules .
So far, every thing works fine. But when I want to iterate the PO_Items node and get each property value of current element, the following error occurs :
com.sap.tc.cm.base.exception.BaseModelRuntimeException: Class 'java.lang.String' of new attribute value is not assignment compatible for attribute 'Prnt_Price' of type 'boolean' in model class 'com.sap.demo.localwd.qaspomodel.Bapiekpo'
    at com.sap.tc.cm.base.model.BaseGenericModelClass.setAttributeValue(BaseGenericModelClass.java:306)
    at com.sap.tc.cm.arfc2.model.ARFC2GenericModelClass.unmarshalFromJCoRecord(ARFC2GenericModelClass.java:287)
    at com.sap.tc.cm.arfc2.model.ARFC2ModelObjectCollection.doUnMarshalAt(ARFC2ModelObjectCollection.java:97)
    at com.sap.tc.cm.arfc2.model.ARFC2ModelObjectCollection.get(ARFC2ModelObjectCollection.java:120)
    at com.sap.tc.webdynpro.progmodel.context.ModelElementList.getElement(ElementList.java:1726)
    ... 72 more
I use the same way to iterate PO_Item_Schedules element. It also works fine. Therefore, I don't know why this error happens?

Hi Experts,
I continue this thread because it seems that I have the same problem as the one asked by Wester Wei.
I'm developping an application on NWDS using CE 7.11 (I've learned RFC2 with the tutorial [here|http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/f0b102ea-efff-2b10-b3aa-d9e84a2c6bb6?overridelayout=true] ). The problem seems to come from the RFC2 Model, but I just import it (and I can't modify it afterwards, because it is a read-only model).
So, you advise to "declare one boolean variable and assign Prnt_Price to that variable." or to "Explicity convert boolean to string.", I think you are right, but I don't know how to do that in my app (in the component controller ?). Therefore, the attribute that occurs the problem is in the context outputs, to I don't know I will be able to affect it before calling the BAPI.
Could you tell me how to fix this problem without modifying the model (because it's read-only) ?
Thank you for advance,
Louis

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