Troubleshooting: Message prompted: “Unable to update knock-off A/R Invoice which has paid tax (payment basis) due to the knock-off date (17/04/2019) was inside a processed SST period.”

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Question : Unable to Save after edited existing A/R Receive Payment and ticked “Is RCHQ”, error message prompted: “Unable to update knock-off A/R Invoice which has paid tax (payment basis) due to the knock-off date (17/04/2019) was inside a processed SST period.”

Unable update knockoff1.png


Possible Reason :

This transaction has knocked-off service tax invoice and SST Processor (for Apr’2019) is done. Service tax is on payment basis and you are not allowed to un-knock-off the Invoices after you have done the SST Processor.


Solution (1) :

Create a New A/R Refund based on cheque return date. Knock-off with AR Payment when customer re-issue payment to your company.


Solution (2) :

Delete the SST processor for Apr’19, then you will able to do Return Cheque in the AR Payment.

After that, run again SST Processor for Apr’19.

Should the result is different with previous submission, you will need to do amendment in MYSST website.


By : Ju Lee 190130, Lay Swan 190517, P190523



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