SOS trade promotion error when release campaign product change UoM

Hello SAP Guru's!

Currently we are facing an issue with a campaign of trade promotion, we complete all the main fields and add some products, when we add them the product show up correctly in the Products assignment block, but when we released the campaign an error comes that says UoM not valid for specific part number, then if we take a look on the product assignment block the unit of measure has been changed automatically for a UoM that is not even configured on MM01 for this material.

Is the first time that we face this issue for this process, that has been running for more than 4 years, I found SAP note

https://websmp230.sap-ag.de/sap(bD1lcyZjPTAwMQ==)/bc/bsp/sno/ui_entry/entry.htm?param=69765F6D6F64653D3030312669765F7361…

But not sure if apply because as far as the product concerns the UoM are correctly but the UoM that pops up when released campaign is not even configured.

Does anyone face a similar situation before????

Any guidence would be greatly appreciated!

Regards,

Sue Mak