Buyer work centre customizations

Hi,

I am trying to validate accrue at receipt flag value at PO shipment level in the buyer work centre using PO_CUSTOM_SUBMISSION_CHECK_PVT package and trying to raise the unexpected error is the value is "No".

I have written the piece of code but it does not seem to work.

Is there any additional steps we need to perform to get the modified code working.

Thanks,

PS.