Can't change vbep-edatu by USEREXIT_MOVE_FIELD_TO_VBEP through SD_SALESDOCUMENT_CREATE

Hi,

I want to change vbep-edatu by USEREXIT_MOVE_FIELD_TO_VBEP through SD_SALESDOCUMENT_CREATE.

A program I wrote at USEREXIT_MOVE_FIELD_TO_VBEP runs correctly and changes vbep-edatu when create sales order in VA01.

However, when create sales order by that BAPI, vbep-edatu changed once but overwritten by FORM VBEP_FUELLEN_VBEPKOM.

How can I change that same as in VA01?

Thanks in advance.

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I wrote at USEREXIT_MOVE_FIELD_TO_VBKD and it worked..