Invoice created with Company segment that is not associated with the BU

Hi,

User has created the invoice with different company segment value in distribution account that is not associated with the legal entity for the invoice BU.

Usually oracle wont allow such cases and pop up error messages. And also this issue is happened twice in our production environment. When I try to replicate the same scenario in test environment, it shows error as expected and also when user try to create such scenario in production, it shows error as expected.

In that case, how oracle allowed user to create such scenario earlier.

P.S. the legal entity has only one company segment that belongs to the invoice BU.