Recently, in our PRD environment, a user was able to post an FI document in a period that was closed. Both the FI (OB52) and MM (MMPV) posting periods were setup correctly, however, the user entered a service entry via ML81N, and the corresponding FI document that posted with the GR was able to post in the closed period.
Version SAP - SAP ECC 6.0
SAP_APPL Release 600 level 0012
Any help would be appreciated.