def __BAP_${trade}_S${sid}_IMPL(__REQ__,__RSP__,__BUF__ = None,__EXT__ = None):
    '''
           索  引：INDEX_S${sindex}_N0
           功  能：${desc}
           节  点：步骤${sindex}
           交  易：${trade}
    '''
    CGC_Debug("开始步骤 ${trade}-STEP[${sindex}]:[${desc}]")
    objResult = None
    try:
        objMethod = ${startFunc}
        while(type(objMethod) is FunctionType):
            objResult = objMethod(__REQ__,__RSP__,__BUF__,__EXT__)
            objMethod = objResult

    except Exception,PyExcp:
        CGC_Trace("异常:步骤[${sindex}],[${errcode + "01"}]-[%s]" % (str(PyExcp)))
        objResult = __BAP_${trade}_S${sid}_EXP(__REQ__,__RSP__,__BUF__,__EXT__,"${errcode + "01"}",str(PyExcp))
    finally:
${logicText}<#rt/>