If you have a locked budget and you receive an item that was ordered from a fund in that budget the receipt page says 'current fund' in the fund box. If you receive though it doesn't keep the fund it blanks it out. It shouldn't list the fund if the fund is locked, it should say "SELECTED FUND DISABLED" or something along those lines
According to documentation, locked should not allow to modify: https://koha-community.org/manual/19.05/en/html/administration.html?highlight=locked#budgets Locking a budget means that funds will not be able to be modified by librarians I read this like it should not affect the ordering/receiving process, but the moving from amounts between funds or similar. Closing, please reopen if you disagree.