Why syncing the bill/expense report to Netsuite show an invalid error?

Cause:

You encountered the error message: INVALID_KEY_OR_REF Invalid posting period reference key <month> <year>.

This error occurs when attempting to post or sync a bill or expense report to NetSuite, and the bill issue date or expense report date falls outside of the allowed posting period. The posting period may be locked in NetSuite, preventing the transaction from being processed.

Resolution:

There are two ways to resolve this issue: 

1. Change the Bill Issue Date: Adjust the bill issue date or expense report date to fall within an open posting period in NetSuite. Ensure the new date is valid and within the allowed range for posting.

2. Unlock the Posting Period in NetSuite: Unlock the relevant posting period in NetSuite to allow the transaction to be posted. This action requires admin-level permissions in NetSuite to modify the lock status of the posting period.