FI substitution of bkpf-xblnr from bseg-rebzg

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Hello Gurus,

Does anybody know answer for the following problem? I would like to change field bkpf-xblnr from bseg-rebzg in FI substitution. When I tried to create substitution on header level in transaction OBBH, I can change bkpf-xblnr, but I dont have available information about value in bseg-rebzg in this time. So I tried to do substituion of xblnr field on the item level. I have changed table GB01 to allow bkpf-xblnr substituable on the item level. Then I regenerated substitutions with program RGUGBR00. Finally I have created exit, where I changed xblnr field from rebzg. Everything is fine in debugger, but finally accounting document is generated with wrong value in the filed bkpf-xblnr. Plase can you help me how to do solve it? Is it possible to change array from BKPF on item level?

Is there some user exist after substitution before generating of accounting document, which can I used for the purposes stated above.

Thank you very much

J.