Create deep insert not working

Hi All,

        I had created Create deep insert for Header detail scenario.

        Things are working fine for GetEntitySet.

         I am able to get Header detail data in Client but when I do post for Header details ,

        Only Header part is going but no Details data is going.

       HTTP Response is 201 is coming but getting only Header Fields no details

       IO_DATA_PROVIDER Method is not getting Detail Data.

     I checked multiple times Model are fine....

     But getting any reason for such behaviors..

     Not getting any error ,also

     Kindly advice

Regards

Vivek