Tax rate stuck due to System.Exception: DI: Posting Period Locked

Tax rate stuck due to System.Exception: DI: Posting Period Locked

Problem Statement:

Tax code Modified in SAP Business One, the change does not appear in iVend Retail

Error: 

Tax code stuck in Integration Failure Monitor with Error System.Exception: DI: Posting Period Locked""

Resolution:

Step 1 : Identify the effective date of the failed tax row from the Failed Monitor (e.g. 04/01/2026).
Step 2: in SAP Open Administration → System Initialisation → Posting Periods
Step 3: Locate the period covering that date. Change status from Closed/Locked to Unlocked / Open.
Step 4: In the iVend Failed Monitor, select the failed Sales Tax events and click Re-process / Retry.