Infor SyteLine: Error Message in AP Voucher Posting form

Issue:
A/P Vouchers cannot be posted from the A/P Voucher Posting form. When posting the A/P voucher, it shows that the transaction was successful, and even the background task history form indicates the task status as 'Successful'. 

However, upon refreshing the A/P Vouchers and Adjustments form, the record/voucher still remains after posting. Additionally, when closing the A/P Voucher Posting form, the following pop-up message appears: "Pending Records to Post will be deleted." 

I checked the Accounting Periods form and the Accounting Periods Control Number Sequence Form and observed that no AP transaction was posted for June (Current Period 3).

Steps to Solve the Issue:

Instructed Customers to Follow the Given Instruction:

1. Identify/Show the Error Message:

   • Step to customize at A/P Voucher Posting form.
   • Open the A/P Voucher Posting form, then select Design mode (hammer icon).
   • Enter Scope and For User/Group values and click OK.
   • Select Edit - Event Handler.
   • Look for Type as 'Method Call'. Check all Method Calls and ensure that 'mBackEndMessage' is assigned in the Error Message field.
     • Highlight a record of Method Call.
     • Click the Edit button.
     • Click on the 'Parms' button and enter 'mBackEndMessage' in the Error Message field.
     • Click OK and Save.

2. Synchronize the Mismatched Sequences:

   • Open the 'Synchronize Next Keys' form.
   • Click the 'Process' button and process the records.