Idoc PORDCR1,Payment term field change for segment E1BPMEPOHEADER

Hi All,

I am stuck in this situation and need guidance.

I have an inbound idoc PORDCR1 which is taking value of payment term from legacy.Since the value was invalid I had to replace the value from table on the basis of vendor mentioned.

Now by making change in z include of custom exit I am getting the value changed. But value in segment data remains same.

Please suggest a way to change value in segment data FOR SEGMENT E1BPMEPOHEADER.

Thanks in advance.