Make sure you do some research before asking questions (your post wasn't really a question at all) and show in your post what you have done already, to avoid that people spent time suggesting things that you already tried and dismissed, and also to avoid the impression that you are just trying to conveniently outsource your own work to the community.
I have done lot of research before posting to forum,
i didn't get any field name for invoice number in ekko, ekpo tables.
i found relevance number in bkpf with field awkey,
i think i don't need that. that's why i have posted,
i searched already in the forum for invoice number or goods receipt number,
i didn't get any relevant information.
If you are referring to this thread: Invoice/Goods Receipt number field, then I have to say that I honestly did not find a question in that post. And since these forums are meant to ask questions, rather than doing a status update, I locked the thread.
PS: Thomas has mentioned some important tips, which you may find very useful for future posting.