Hi @NTHeli,
That error would definitely do your head in, so good on you for digging into it. We actually have a similar post that covers this same STP Lump Sum issue that might help you sort it out. Here's the link: ATO error code: CMN.ATO.PAYEVNTEMP.000372 | MYOB Community.
If you're still getting the same error after trying that, just jump onto our live chat support through our virtual assistant, MOCA, or submit a case via My Account, and the team can dig deeper with you.
Regards,
Sai
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