PO Creation : Portal Error " ASSERTION_FAILED "

Hi,

While creation of PO by using OP_BUYRER user ID, I am getting below error in Portal. I have roles assigned in Portal, ABAP-SRM and ECC.

Any reason for this error?

Error :

Method:  ADD_EVENT_TO_QUEUE of program CL_FPM========================CP

Method:  IF_FPM~RAISE_EVENT of program CL_FPM========================CP

Method:  SET_CREATE_BUTTON_ACTIVE of program /1BCWDY/03N7C4GLNXNTUW30Z88P==CP

Method:  IF_COMPONENTCONTROLLER~SET_CREATE_BUTTON_ACTIVE of program /1BCWDY/03N7C4GLNXNTUW30Z88P==CP

Method:  RESET_SCREEN of program /1BCWDY/03N7C4GLNXNTUW30Z88P==CP

Method:  IF_V_PRSEL~RESET_SCREEN of program /1BCWDY/03N7C4GLNXNTUW30Z88P==CP

Method:  WDDOMODIFYVIEW of program /1BCWDY/03N7C4GLNXNTUW30Z88P==CP

Method:  IF_WDR_VIEW_DELEGATE~WD_DO_MODIFY_VIEW of program /1BCWDY/03N7C4GLNXNTUW30Z88P==CP

Method:  DO_MODIFY_VIEW of program CL_WDR_DELEGATING_VIEW========CP

Method:  MODIFY_VIEW of program CL_WDR_VIEW===================CP

Thanks,

Rahul Mandale