客户提出有5列样本，分别记作样本1，样本2， 样本3， 样本4，样本5。 取样数量不一定，有时取3个样本，有时取5个本。然后将取样数作平均数存放在样本平均值字段上。 

做了python 小插件。 

import clr

clr.AddReference("Kingdee.BOS")
clr.AddReference("Kingdee.BOS.Core")
clr.AddReference("Kingdee.BOS.ServiceHelper")

from System import DateTime
from Kingdee.BOS.Core import *
from Kingdee.BOS.ServiceHelper import *


def DataChanged(e):
    fbilltypeid = this.View.Model.GetValue("FBillTypeID")   # 单据类型
    if fbilltypeid["Id"].ToString() != "635cbdae6f70dd":  # 635cbdae6f70dd ， 指定的单据类型计算样本平均数
        # this.View.ShowMessage(fbilltypeid["Id"].ToString())
        return
    if (
    # 触发值更新的五个样本字段
        e.Key == "F_NBDF_YB1"
        or e.Key == "F_NBDF_YB2"
        or e.Key == "F_NBDF_YB3"
        or e.Key == "F_NBDF_YB4"
        or e.Key == "F_NBDF_YB5"
    ):
        rowCount = 0   #  取样数量
        rowCount = this.View.Model.GetEntryRowCount("FItemDetail")
        cnt = 0
        yb_avg = 0

        F_NBDF_YB1 = this.View.Model.GetValue("F_NBDF_YB1", e.Row)
        F_NBDF_YB2 = this.View.Model.GetValue("F_NBDF_YB2", e.Row)
        F_NBDF_YB3 = this.View.Model.GetValue("F_NBDF_YB3", e.Row)
        F_NBDF_YB4 = this.View.Model.GetValue("F_NBDF_YB4", e.Row)
        F_NBDF_YB5 = this.View.Model.GetValue("F_NBDF_YB5", e.Row)
       
        if F_NBDF_YB1 > 0:
            cnt += 1
        if F_NBDF_YB2 > 0:
            cnt += 1
        if F_NBDF_YB3 > 0:
            cnt += 1
        if F_NBDF_YB4 > 0:
            cnt += 1
        if F_NBDF_YB5 > 0:
            cnt += 1
        if cnt > 1:
            yb_avg = (
                F_NBDF_YB1 + F_NBDF_YB2 + F_NBDF_YB3 + F_NBDF_YB4 + F_NBDF_YB5
            ) / cnt
        this.View.Model.SetValue("F_NBDF_AVG", yb_avg, e.Row)
        this.View.UpdateView("F_NBDF_AVG", e.Row)