Build Context on different segments using udf

Hi All,

I have delivery IDOC where the date in E1EDL24-VFDAT needs to match the context asame as in E1EDL44-MATNR.

For this i can use useOneAsMany function if the context match both in E1EDL24 and E1EDL44.

But my idoc will have batch and mutiple handling units where E1EDL44 segment may exist more than one in each E1EDL37 segment for same material if it is batch  and it can have mutiple E1EDL37 segments for same material . Here is the example

For same material the 2nd and 3rd material belongs to batch

1) E1EDL24

     MATNR = 123

     VFDAT = 20151003

2) E1EDL24

     MATNR = 123

     VFDAT = 20151004

3) E1EDL24

     MATNR =123

     VFDAT = 20151006

1) E1EDL37 ----->mutiple handling units

     E1EDL44

          MATNR  =123

          CHARG = 23455

2) E1EDL37----->mutiple handling units

     E1EDL44

          MATNR  =123

          CHARG = 23455

3) E1EDL37----->mutiple handling units

     E1EDL44

          MATNR  =123

          CHARG = 23455

4)  E1EDL37----->Batch

     E1EDL44

          MATNR  =123

          CHARG = 23456

      E1EDL44

          MATNR  =123

          CHARG = 23454

So I want to build the context for VFDAT same as MATNR in E1EDL44

      1) MATNR 123     VFDAT 20151003

     2)  MATNR 123     VFDAT 20151003

     3)  MATNR 123     VFDAT 20151003

     4) MATNR  =123     VFDAT 20151004

         MATNR  =123     VFDAT 20151006

Can anyone please help me in building  this context using udf.