Hi GN
I am not 100% sure what you mean exactly maybe you could explain the exact details in an example.
Anyway there are some points to consider, if you use number range buffering the sequential number assignment can never be guaranteed because of the way the numbers are issued from the buffer.
As far as the assignment of the FI documents perhaps you can overcome this issue by splitting the creation of the invoice in VF04 from the creation of the accounting document. If you set a posting block on the affected billing types in VOFA, VF04 will only create the billing document in that step. You can then schedule RVFAKSPE to run afterwards to release the billing documents to accounting, probably when the billing document numbers are committed already to the database the issue of sequence will be resolved ?
I hope it helps
Kind regards
Brian