User exit for updating BSEG (FI Document field) during SD billing.

Hello SD Experts

I am FI Consultant.

I have one requirement. I want to capture "Bill to Party" customer code in XREF1 field (Reference Key 1 field) in FI document table - BSEG. I want to capture for all line items.

For this I will have to write user exit. I want to know, if I can use following user exit. This exit should work for billing creation, change and cancellation. I hope below exit is fine.

SDVFX007

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Meena